@@ -1,4 +1,7 @@
1{-# LANGUAGE ScopedTypeVariables #-}
1{-# LANGUAGE ScopedTypeVariables #-}
2+{-# LANGUAGE FlexibleInstances #-}
3+{-# LANGUAGE FlexibleContexts #-}
4+{-# LANGUAGE OverloadedStrings #-}
2module ProjectM36.RelationalExpression where
5module ProjectM36.RelationalExpression where
3import ProjectM36.Relation
6import ProjectM36.Relation
4import ProjectM36.Tuple
7import ProjectM36.Tuple
@@ -7,32 +10,44 @@ import ProjectM36.Base
7import qualified Data.UUID as U
10import qualified Data.UUID as U
8import ProjectM36.Error
11import ProjectM36.Error
9import ProjectM36.AtomType
12import ProjectM36.AtomType
10−import ProjectM36.Attribute (emptyAttributes)
13+import ProjectM36.Attribute (emptyAttributes, attributesFromList)
11import ProjectM36.ScriptSession
14import ProjectM36.ScriptSession
12import ProjectM36.DataTypes.Primitive
15import ProjectM36.DataTypes.Primitive
13import ProjectM36.AtomFunction
16import ProjectM36.AtomFunction
14import ProjectM36.DatabaseContextFunction
17import ProjectM36.DatabaseContextFunction
15import ProjectM36.Arbitrary
18import ProjectM36.Arbitrary
19+import ProjectM36.GraphRefRelationalExpr
20+import ProjectM36.Transaction
16import qualified ProjectM36.Attribute as A
21import qualified ProjectM36.Attribute as A
17import qualified Data.Map as M
22import qualified Data.Map as M
18import qualified Data.HashSet as HS
23import qualified Data.HashSet as HS
19import qualified Data.Set as S
24import qualified Data.Set as S
20import Control.Monad.State hiding (join)
25import Control.Monad.State hiding (join)
21−import Control.Exception
26+import Data.Bifunctor (second)
22import Data.Maybe
27import Data.Maybe
23import Data.Either
28import Data.Either
24import Data.Char (isUpper)
29import Data.Char (isUpper)
31+import qualified Data.List.NonEmpty as NE
32+import Data.Functor.Identity
25import qualified Data.Text as T
33import qualified Data.Text as T
26import qualified Data.Vector as V
34import qualified Data.Vector as V
27import qualified ProjectM36.TypeConstructorDef as TCD
35import qualified ProjectM36.TypeConstructorDef as TCD
28−import Control.Monad.Trans.Except
36+import qualified Control.Monad.RWS.Strict as RWS
37+import Control.Monad.RWS.Strict (RWST, execRWST, runRWST)
38+import Control.Monad.Except hiding (join)
29−import Control.Monad.Trans.Reader
39+import Control.Monad.Trans.Except (except)
40+import Control.Monad.Reader as R hiding (join)
41+import ProjectM36.NormalizeExpr
42+import ProjectM36.WithNameExpr
30import Test.QuickCheck
43import Test.QuickCheck
31−import GHC
44+import qualified Data.Functor.Foldable as Fold
45+import Control.Applicative
46+#ifdef PM36_HASKELL_SCRIPTING
47+import GHC hiding (getContext)
48+import Control.Exception
32import GHC.Paths
49import GHC.Paths
33−import Data.Time.Clock
50+#endif
34−import Data.Time.Calendar
35−import qualified Data.List.NonEmpty as NE
37data DatabaseContextExprDetails = CountUpdatedTuples
52data DatabaseContextExprDetails = CountUpdatedTuples
@@ -49,41 +64,63 @@ databaseContextExprDetailsFunc CountUpdatedTuples _ relIn = Relation attrs newTu
49 Right ts -> ts
64 Right ts -> ts
51-- | Used to start a fresh database state for a new database context expression.
66-- | Used to start a fresh database state for a new database context expression.
52−freshDatabaseState :: DatabaseContext -> DatabaseStateElems
67+mkDatabaseContextEvalState :: DatabaseContext -> DatabaseContextEvalState
53−freshDatabaseState context = DatabaseStateElems {
68+mkDatabaseContextEvalState context = DatabaseContextEvalState {
54− context = context,
69+ dbc_context = context,
55− accum = M.empty,
70+ dbc_accum = M.empty,
56− dirty = False
71+ dbc_dirty = False
57 } --future work: propagate return accumulator
72 } --future work: propagate return accumulator
59-- we need to pass around a higher level RelationTuple and Attributes in order to solve #52
74-- we need to pass around a higher level RelationTuple and Attributes in order to solve #52
60−data RelationalExprStateElems = RelationalExprStateTupleElems
75+data RelationalExprEnv = RelationalExprEnv {
61− DatabaseContext
76+ re_context :: DatabaseContext,
62− TransactionGraph
77+ re_graph :: TransactionGraph,
63− Maybe (Either RelationTuple Attributes)
78+ re_extra :: Maybe (Either RelationTuple Attributes)
65−data RelationalExprStateElems = RelationalExprStateTupleElems DatabaseContext RelationTuple | -- used when fully evaluating a relexpr
80+
66− RelationalExprStateAttrsElems DatabaseContext Attributes | --used when evaluating the type of a relexpr
81+envTuple :: GraphRefRelationalExprEnv -> RelationTuple
67− RelationalExprStateElems DatabaseContext --used by default at the top level of evaluation
82+envTuple e = fromLeft emptyTuple (fromMaybe (Left emptyTuple) (gre_extra e))
69−instance Show RelationalExprStateElems where
84+envAttributes :: GraphRefRelationalExprEnv -> Attributes
70− show (RelationalExprStateTupleElems _ tup) = "RelationalExprStateTupleElems " ++ show tup
85+envAttributes e = fromRight emptyAttributes (fromMaybe (Right emptyAttributes) (gre_extra e))
71− show (RelationalExprStateAttrsElems _ attrs) = "RelationalExprStateAttrsElems" ++ show attrs
72− show (RelationalExprStateElems _) = "RelationalExprStateElems"
74−mkRelationalExprState :: DatabaseContext -> RelationalExprStateElems
75−mkRelationalExprState = RelationalExprStateElems
77−mergeTuplesIntoRelationalExprState :: RelationTuple -> RelationalExprStateElems -> RelationalExprStateElems
78−mergeTuplesIntoRelationalExprState tupIn (RelationalExprStateElems ctx) = RelationalExprStateTupleElems ctx tupIn
79−mergeTuplesIntoRelationalExprState _ st@(RelationalExprStateAttrsElems _ _) = st
80−mergeTuplesIntoRelationalExprState tupIn (RelationalExprStateTupleElems ctx existingTuple) = let mergedTupMap = M.union (tupleToMap tupIn) (tupleToMap existingTuple) in
81− RelationalExprStateTupleElems ctx (mkRelationTupleFromMap mergedTupMap)
83−mergeAttributesIntoRelationalExprState :: Attributes -> RelationalExprStateElems -> RelationalExprStateElems
87+instance Show RelationalExprEnv where
84−mergeAttributesIntoRelationalExprState attrs (RelationalExprStateElems ctx) = RelationalExprStateAttrsElems ctx attrs
88+ show e@RelationalExprEnv{} = "RelationalExprEnv " ++ show (re_extra e)
85−mergeAttributesIntoRelationalExprState _ st@(RelationalExprStateTupleElems _ _) = st
89+
86−mergeAttributesIntoRelationalExprState attrsIn (RelationalExprStateAttrsElems ctx attrs) = RelationalExprStateAttrsElems ctx (A.union attrsIn attrs)
90+--used to eval relationalexpr
91+type RelationalExprM a = ReaderT RelationalExprEnv (ExceptT RelationalError Identity) a
93+runRelationalExprM :: RelationalExprEnv -> RelationalExprM a -> Either RelationalError a
94+runRelationalExprM env m = runIdentity (runExceptT (runReaderT m env))
96+reGraph :: RelationalExprM TransactionGraph
97+reGraph = asks re_graph
99+reContext :: RelationalExprM DatabaseContext
100+reContext = asks re_context
102+mkRelationalExprEnv :: DatabaseContext -> TransactionGraph -> RelationalExprEnv
103+mkRelationalExprEnv ctx graph =
107+ re_extra = Nothing }
109+askEnv :: GraphRefRelationalExprM GraphRefRelationalExprEnv
112+mergeTuplesIntoGraphRefRelationalExprEnv :: RelationTuple -> GraphRefRelationalExprEnv -> GraphRefRelationalExprEnv
113+mergeTuplesIntoGraphRefRelationalExprEnv tupIn env =
114+ env { gre_extra = new_elems }
116+ new_elems = Just (Left newTuple)
117+ mergedTupMap = M.union (tupleToMap tupIn) (tupleToMap (envTuple env))
118+ newTuple = mkRelationTupleFromMap mergedTupMap
120+mergeAttributesIntoGraphRefRelationalExprEnv :: Attributes -> GraphRefRelationalExprEnv -> GraphRefRelationalExprEnv
121+mergeAttributesIntoGraphRefRelationalExprEnv attrsIn e = e { gre_extra = newattrs }
123+ newattrs = Just (Right (A.union attrsIn (envAttributes e)))
88type ResultAccumName = StringType
125type ResultAccumName = StringType
@@ -93,443 +130,403 @@ data ResultAccum = ResultAccum { resultAccumFunc :: ResultAccumFunc,
93 resultAccumResult :: Relation
130 resultAccumResult :: Relation
96−data DatabaseStateElems = DatabaseStateElems {
133+data DatabaseContextEvalState = DatabaseContextEvalState {
97− context :: DatabaseContext, --new, alterable context for a new transaction
134+ dbc_context :: DatabaseContext, --new, alterable context for a new transaction
98− accum :: M.Map ResultAccumName ResultAccum,
135+ dbc_accum :: M.Map ResultAccumName ResultAccum,
99− dirty :: DirtyFlag
136+ dbc_dirty :: DirtyFlag
102−type DatabaseState a = State DatabaseStateElems a
139+data DatabaseContextEvalEnv = DatabaseContextEvalEnv
140+ { dce_transId :: TransactionId,
141+ dce_graph :: TransactionGraph
144+mkDatabaseContextEvalEnv :: TransactionId -> TransactionGraph -> DatabaseContextEvalEnv
145+mkDatabaseContextEvalEnv = DatabaseContextEvalEnv
147+type DatabaseContextEvalMonad a = RWST DatabaseContextEvalEnv () DatabaseContextEvalState (ExceptT RelationalError Identity) a
104−getStateContext :: DatabaseState DatabaseContext
149+runDatabaseContextEvalMonad :: DatabaseContext -> DatabaseContextEvalEnv -> DatabaseContextEvalMonad () -> Either RelationalError DatabaseContextEvalState
105−getStateContext = context <$> get
150+runDatabaseContextEvalMonad ctx env m = runIdentity (runExceptT (fst <$> execRWST m env freshEnv))
152+ freshEnv = mkDatabaseContextEvalState ctx
155+dbcTransId :: DatabaseContextEvalMonad TransactionId
156+dbcTransId = dce_transId <$> RWS.ask
158+dbcGraph :: DatabaseContextEvalMonad TransactionGraph
159+dbcGraph = dce_graph <$> RWS.ask
161+dbcRelationalExprEnv :: DatabaseContextEvalMonad RelationalExprEnv
162+dbcRelationalExprEnv =
163+ mkRelationalExprEnv <$> getStateContext <*> dbcGraph
165+getStateContext :: DatabaseContextEvalMonad DatabaseContext
166+getStateContext = gets dbc_context
107−putStateContext :: DatabaseContext -> DatabaseState ()
168+putStateContext :: DatabaseContext -> DatabaseContextEvalMonad ()
108putStateContext ctx' = do
169putStateContext ctx' = do
110− put (s {context = ctx'})
171+ put (s {dbc_context = ctx', dbc_dirty = True})
112−type RelationalExprState a = Reader RelationalExprStateElems a
173+-- | The context is optionally passed down along in cases where the current context is uncommitted.
113−
174+data GraphRefRelationalExprEnv =
114−stateElemsContext :: RelationalExprStateElems -> DatabaseContext
175+ GraphRefRelationalExprEnv {
115−stateElemsContext (RelationalExprStateTupleElems ctx _) = ctx
176+ gre_context :: Maybe DatabaseContext,
116−stateElemsContext (RelationalExprStateElems ctx) = ctx
177+ gre_graph :: TransactionGraph,
117−stateElemsContext (RelationalExprStateAttrsElems ctx _) = ctx
178+ gre_extra :: Maybe (Either RelationTuple Attributes)
119−setStateElemsContext :: RelationalExprStateElems -> DatabaseContext -> RelationalExprStateElems
120−setStateElemsContext (RelationalExprStateTupleElems _ tup) ctx = RelationalExprStateTupleElems ctx tup
121−setStateElemsContext (RelationalExprStateElems _) ctx = RelationalExprStateElems ctx
122−setStateElemsContext (RelationalExprStateAttrsElems _ attrs) ctx = RelationalExprStateAttrsElems ctx attrs
124−--relvar state is needed in evaluation of relational expression but only as read-only in order to extract current relvar values
125−evalRelationalExpr :: RelationalExpr -> RelationalExprState (Either RelationalError GraphRefRelationalExpr)
126−evalRelationalExpr (RelationVariable name _) = do
127− relvarTable <- fmap (relationVariables . stateElemsContext) ask
128− return $ case M.lookup name relvarTable of
129− Just res -> Right res
130− Nothing -> Left $ RelVarNotDefinedError name
132−evalRelationalExpr (Project attrNames expr) = do
133− eAttrNameSet <- evalAttributeNames attrNames expr
134− case eAttrNameSet of
135− Left err -> pure (Left err)
136− Right attrNameSet -> do
137− rel <- evalRelationalExpr expr
139− Right rel2 -> pure $ Right (Project (AttributeNames attrNameSet) rel2)
140− Left err -> pure $ Left err
142−evalRelationalExpr (Union exprA exprB) = do
143− relA <- evalRelationalExpr exprA
144− relB <- evalRelationalExpr exprB
146− Left err -> return $ Left err
147− Right relA2 -> case relB of
148− Left err -> return $ Left err
149− Right relB2 -> return $ Right (Union relA2 relB2)
151−evalRelationalExpr (Join exprA exprB) = do
152− relA <- evalRelationalExpr exprA
153− relB <- evalRelationalExpr exprB
155− Left err -> return $ Left err
156− Right relA2 -> case relB of
157− Left err -> return $ Left err
158− Right relB2 -> return $ Right (Join relA2 relB2)
160−evalRelationalExpr (Difference exprA exprB) = do
161− relA <- evalRelationalExpr exprA
162− relB <- evalRelationalExpr exprB
164− Left err -> return $ Left err
165− Right relA2 -> case relB of
166− Left err -> return $ Left err
167− Right relB2 -> return $ Right (Difference relA2 relB2)
169−evalRelationalExpr (MakeStaticRelation attributeSet tupleSet) =
170− case mkRelation attributeSet tupleSet of
171− Right rel -> return $ Right (ExistingRelation rel)
172− Left err -> return $ Left err
174−evalRelationalExpr (MakeRelationFromExprs mAttrExprs tupleExprs) = do
175− currentContext <- fmap stateElemsContext ask
176− let tConss = typeConstructorMapping currentContext
177− -- if the mAttrExprs is Nothing, then we should attempt to infer the tuple attributes from the first tuple itself- note that this is not always possible
179− mAttrs <- case mAttrExprs of
181− Just . A.attributesFromList <$> mapM (either throwE pure . evalAttrExpr tConss) (fromMaybe [] mAttrExprs)
182− Nothing -> pure Nothing
183− tuples <- mapM (liftE . evalTupleExpr mAttrs) tupleExprs
184− let attrs = fromMaybe firstTupleAttrs mAttrs
185− firstTupleAttrs = if null tuples then A.emptyAttributes else tupleAttributes (head tuples)
186− expr <- either throwE pure (mkRelation attrs (RelationTupleSet tuples))
187− pure (ExistingRelation expr)
189−evalRelationalExpr (ExistingRelation rel) = pure (Right (ExistingRelation rel))
181+type GraphRefRelationalExprM a = ReaderT GraphRefRelationalExprEnv (ExceptT RelationalError Identity) a
183+gfTransForId :: TransactionId -> GraphRefRelationalExprM Transaction
184+gfTransForId tid = do
186+ lift $ except $ transactionForId tid graph
188+gfDatabaseContextForMarker :: GraphRefTransactionMarker -> GraphRefRelationalExprM DatabaseContext
189+gfDatabaseContextForMarker (TransactionMarker transId) = concreteDatabaseContext <$> gfTransForId transId
190+gfDatabaseContextForMarker UncommittedContextMarker = do
191+ mctx <- gre_context <$> askEnv
193+ Nothing -> throwError NoUncommittedContextInEvalError
194+ Just ctx -> pure ctx
196+runGraphRefRelationalExprM :: GraphRefRelationalExprEnv -> GraphRefRelationalExprM a -> Either RelationalError a
197+runGraphRefRelationalExprM env m = runIdentity (runExceptT (runReaderT m env))
199+freshGraphRefRelationalExprEnv :: Maybe DatabaseContext -> TransactionGraph -> GraphRefRelationalExprEnv
200+freshGraphRefRelationalExprEnv mctx graph = GraphRefRelationalExprEnv {
191−evalRelationalExpr (Rename oldAttrName newAttrName relExpr) = do
206+gfGraph :: GraphRefRelationalExprM TransactionGraph
192− evald <- evalRelationalExpr relExpr
207+gfGraph = asks gre_graph
194− Right expr -> return $ Right (Rename oldAttrName newAttrName expr)
195− Left err -> return $ Left err
197−evalRelationalExpr (Group oldAttrNames newAttrName relExpr) = do
209+envContext :: RelationalExprEnv -> DatabaseContext
198− eOldAttrNameSet <- evalAttributeNames oldAttrNames relExpr
210+envContext = re_context
199− case eOldAttrNameSet of
211+
200− Left err -> pure (Left err)
212+setEnvContext :: RelationalExprEnv -> DatabaseContext -> RelationalExprEnv
201− Right oldAttrNameSet -> do
213+setEnvContext e ctx = e { re_context = ctx }
202− evald <- evalRelationalExpr relExpr
204− Right expr -> return $ Right (Group (AttributeNames oldAttrNameSet) newAttrName expr)
205− Left err -> return $ Left err
207−evalRelationalExpr (Ungroup attrName relExpr) = do
208− evald <- evalRelationalExpr relExpr
210− Right expr -> return $ Right (Ungroup attrName expr)
211− Left err -> return $ Left err
213−evalRelationalExpr (Restrict predicateExpr relExpr) = do
214− evald <- evalRelationalExpr relExpr
215− ePred <- processRestrictionPredicateExpr predicateExpr
217− Left err -> return $ Left err
218− Right expr -> case ePred of
219− Left err -> pure (Left err)
220− Right pred -> pure $ Right (Restrict pred expr)
222−evalRelationalExpr (Equals relExprA relExprB) = do
223− evaldA <- evalRelationalExpr relExprA
224− evaldB <- evalRelationalExpr relExprB
226− Left err -> return $ Left err
227− Right exprA -> case evaldB of
228− Left err -> return $ Left err
229− Right exprB -> return $ Right (Equals exprA exprB)
231−evalRelationalExpr (With views mainExpr) = do
234− let addScopedView ctx (vname,vexpr) = if vname `M.member` relationVariables ctx then
235− Left (RelVarAlreadyDefinedError vname)
237− case runState (evalDatabaseContextExpr (Assign vname vexpr)) (freshDatabaseState ctx) of
238− (Left err,_) -> Left err
239− (Right (), (ctx',_,_)) -> Right ctx'
241− case foldM addScopedView (stateElemsContext rstate) views of
242− Left err -> return $ Left err
244− let evalMainExpr expr = runReader (evalRelationalExpr expr) (RelationalExprStateElems ctx'')
245− case evalMainExpr mainExpr of
246− Left err -> return $ Left err
247− Right rel -> return $ Right rel
249−--warning: copy-pasta from above- refactor
250−evalRelationalExpr (NotEquals relExprA relExprB) = do
251− evaldA <- evalRelationalExpr relExprA
252− evaldB <- evalRelationalExpr relExprB
254− Left err -> return $ Left err
255− Right exprA -> case evaldB of
256− Left err -> return $ Left err
257− Right exprB -> return $ Right (NotEquals exprA exprB)
259−-- extending a relation adds a single attribute with the results of the per-tuple expression evaluated
260−evalRelationalExpr (Extend tupleExpression relExpr) = do
261− eExpr <- evalRelationalExpr relExpr
263− Left err -> pure (Left err)
265− eTupProc <- processExtendTupleExpr tupleExpression
267− Left err -> pure (Left err)
268− Right tupProc -> pure (Right (Extend tupProc expr))
270--helper function to process relation variable creation/assignment
215--helper function to process relation variable creation/assignment
271−setRelVar :: RelVarName -> GraphRefRelationalExpr -> TransactionId -> TransactionGraph -> DatabaseState (Either RelationalError ())
216+setRelVar :: RelVarName -> GraphRefRelationalExpr -> DatabaseContextEvalMonad ()
272−setRelVar relVarName relExpr transId graph = do
217+setRelVar relVarName relExpr = do
273 currentContext <- getStateContext
218 currentContext <- getStateContext
219+ --prevent recursive relvar definition by resolving references to relvars in previous states
220+ relExpr' <- resolve relExpr
274− let newRelVars = M.insert relVarName relExpr $ relationVariables currentContext
221+ let newRelVars = M.insert relVarName relExpr' $ relationVariables currentContext
275 potentialContext = currentContext { relationVariables = newRelVars }
222 potentialContext = currentContext { relationVariables = newRelVars }
223+ --optimization: if the relexpr is unchanged, skip the update
224+ if M.lookup relVarName (relationVariables currentContext) == Just relExpr then
276− --determine when to check constraints
227+ --determine when to check constraints
277−
228+ graph <- dbcGraph
278− case checkConstraints potentialContext transId graph of
230+ case checkConstraints potentialContext tid graph of
279− Left err -> pure (Left err)
231+ Left err -> dbErr err
281− putStateContext potentialContext
232+ Right _ -> putStateContext potentialContext
282− return (Right ())
233+
234+--fast-path insertion- we already know that the previous relvar validated correctly, so we can validate just the relation that is being inserted for attribute matches- without this, even a single tuple relation inserted causes the entire relation to be re-validated unnecessarily
235+--insertIntoRelVar :: RelVarName -> GraphRefRelationalExpr -> DatabaseContextEvalMonad ()
284-- it is not an error to delete a relvar which does not exist, just like it is not an error to insert a pre-existing tuple into a relation
237-- it is not an error to delete a relvar which does not exist, just like it is not an error to insert a pre-existing tuple into a relation
285−deleteRelVar :: RelVarName -> DatabaseState (Either RelationalError ())
238+deleteRelVar :: RelVarName -> DatabaseContextEvalMonad ()
286deleteRelVar relVarName = do
239deleteRelVar relVarName = do
287 currContext <- getStateContext
240 currContext <- getStateContext
288 let relVars = relationVariables currContext
241 let relVars = relationVariables currContext
289 if M.notMember relVarName relVars then
242 if M.notMember relVarName relVars then
290− pure (Right ())
243+ pure ()
292 let newRelVars = M.delete relVarName relVars
245 let newRelVars = M.delete relVarName relVars
293 newContext = currContext { relationVariables = newRelVars }
246 newContext = currContext { relationVariables = newRelVars }
294 putStateContext newContext
247 putStateContext newContext
295− pure (Right ())
248+ pure ()
297−evalDatabaseContextExpr :: DatabaseContextExpr -> TransactionId -> TransactionGraph -> DatabaseState (Either RelationalError ())
250+evalGraphRefDatabaseContextExpr :: GraphRefDatabaseContextExpr -> DatabaseContextEvalMonad ()
298−evalDatabaseContextExpr NoOperation _ _ = pure (Right ())
251+evalGraphRefDatabaseContextExpr NoOperation = pure ()
300−evalDatabaseContextExpr (Define relVarName attrExprs) transId graph = do
253+evalGraphRefDatabaseContextExpr (Define relVarName attrExprs) = do
254+ context <- getStateContext
301 relvars <- fmap relationVariables getStateContext
255 relvars <- fmap relationVariables getStateContext
302 tConss <- fmap typeConstructorMapping getStateContext
256 tConss <- fmap typeConstructorMapping getStateContext
303− let eAttrs = map (evalAttrExpr tConss) attrExprs
257+ graph <- dbcGraph
304− attrErrs = lefts eAttrs
258+ let eAttrs = runGraphRefRelationalExprM gfEnv (mapM evalGraphRefAttrExpr attrExprs)
305− attrsList = rights eAttrs
259+ gfEnv = freshGraphRefRelationalExprEnv (Just context) graph
306− if not (null attrErrs) then
260+ case eAttrs of
307− pure (Left (someErrors attrErrs))
261+ Left err -> dbErr err
308− else do
262+ Right attrsList -> do
309− let atomTypeErrs = lefts $ map ((`validateAtomType` tConss) . A.atomType) attrsList
263+ lift $ except $ validateAttributes tConss (A.attributesFromList attrsList)
310− if not (null atomTypeErrs) then
311− pure (Left (someErrors atomTypeErrs))
313− case M.member relVarName relvars of
264+ case M.member relVarName relvars of
314− True -> pure (Left (RelVarAlreadyDefinedError relVarName))
265+ True -> dbErr (RelVarAlreadyDefinedError relVarName)
315− False -> setRelVar relVarName (ExistingRelation emptyRelation) transId graph >> pure (Right ())
266+ False -> setRelVar relVarName (ExistingRelation emptyRelation)
317 attrs = A.attributesFromList attrsList
268 attrs = A.attributesFromList attrsList
318 emptyRelation = Relation attrs emptyTupleSet
269 emptyRelation = Relation attrs emptyTupleSet
320−evalDatabaseContextExpr (Undefine relVarName) _ _ = deleteRelVar relVarName
271+evalGraphRefDatabaseContextExpr (Undefine relVarName) = deleteRelVar relVarName
322−evalDatabaseContextExpr (Assign relVarName expr) transId graph = do
273+evalGraphRefDatabaseContextExpr (Assign relVarName expr) = do
274+ graph <- re_graph <$> dbcRelationalExprEnv
323 context <- getStateContext
275 context <- getStateContext
324 let existingRelVar = M.lookup relVarName (relationVariables context)
276 let existingRelVar = M.lookup relVarName (relationVariables context)
325− relExprState = mkRelationalExprState context
277+ reEnv = freshGraphRefRelationalExprEnv (Just context) graph
278+ eNewExprType = runGraphRefRelationalExprM reEnv (typeForGraphRefRelationalExpr expr)
326 case existingRelVar of
279 case existingRelVar of
327 Nothing -> do
280 Nothing -> do
328− let ervExpr = runReader (evalRelationalExpr expr) relExprState
281+ case runGraphRefRelationalExprM reEnv (typeForGraphRefRelationalExpr expr) of
330− Left err -> pure (Left err)
282+ Left err -> dbErr err
284+ lift $ except $ validateAttributes (typeConstructorMapping context) (attributes reltype)
331− Right rvExpr -> setRelVar relVarName rvExpr transId graph
285+ setRelVar relVarName expr
332 Just existingRel -> do
286 Just existingRel -> do
333− let eExpectedType = typeForGraphRefRelationalExpr existingRel graph
287+ let eExpectedType = runGraphRefRelationalExprM reEnv (typeForGraphRefRelationalExpr existingRel)
334− eNewExprType = runReader (typeForRelationalExpr expr transId graph) relExprState
335 case eExpectedType of
288 case eExpectedType of
336− Left err -> pure (Left err)
289+ Left err -> dbErr err
337 Right expectedType ->
290 Right expectedType ->
338 case eNewExprType of
291 case eNewExprType of
339− Left err -> pure (Left err)
292+ Left err -> dbErr err
340 Right newExprType -> do
293 Right newExprType -> do
341 if newExprType == expectedType then do
294 if newExprType == expectedType then do
342− let ervExpr = runReader (evalRelationalExpr expr) relExprState
295+ lift $ except $ validateAttributes (typeConstructorMapping context) (attributes newExprType)
344− Left err -> pure (Left err)
345− Right rvExpr -> setRelVar relVarName rvExpr transId graph
296+ setRelVar relVarName expr
347− pure (Left (RelationTypeMismatchError (attributes expectedType) (attributes newExprType)))
298+ dbErr (RelationTypeMismatchError (attributes expectedType) (attributes newExprType))
349−evalDatabaseContextExpr (Insert relVarName relExpr) tid graph =
300+evalGraphRefDatabaseContextExpr (Insert relVarName relExpr) = do
350− evalDatabaseContextExpr (Assign relVarName (Union (RelationVariable relVarName ())
301+ gfExpr <- relVarByName relVarName
351− relExpr)) tid graph
302+ let optExpr = applyUnionCollapse (Union
305+ evalGraphRefDatabaseContextExpr (Assign relVarName optExpr)
353−evalDatabaseContextExpr (Delete relVarName predicate) transId graph = do
307+evalGraphRefDatabaseContextExpr (Delete relVarName predicate) = do
354− ctx <- getStateContext
308+ gfExpr <- relVarByName relVarName
355− let rv = RelationVariable relVarName transId
309+ let optExpr = applyRestrictionCollapse (Restrict (NotPredicate predicate) gfExpr)
356− rvState = mkRelationalExprState ctx
310+ setRelVar relVarName optExpr
357− case runReader (processRestrictionPredicateExpr predicate) rvState of
358− Left err -> pure (Left err)
359− Right graphRefPredicate ->
360− setRelVar relVarName (Restrict (NotPredicate graphRefPredicate) rv) transId graph
362--union of restricted+updated portion and the unrestricted+unupdated portion
312--union of restricted+updated portion and the unrestricted+unupdated portion
363−evalDatabaseContextExpr (Update relVarName atomExprMap restrictionPredicateExpr) transId graph = do
313+evalGraphRefDatabaseContextExpr (Update relVarName atomExprMap pred') = do
314+ rvExpr <- relVarByName relVarName
315+ graph <- re_graph <$> dbcRelationalExprEnv
364 context <- getStateContext
316 context <- getStateContext
365− let rvState = mkRelationalExprState context
317+ let reEnv = freshGraphRefRelationalExprEnv (Just context) graph
366− relVarTable = relationVariables context
318+ --get the current attributes name in the relvar to ensure that we don't conflict when renaming
367− case runReader (processRestrictionPredicateExpr restrictionPredicateExpr) rvState of
319+ eExprType = runGraphRefRelationalExprM reEnv (typeForGraphRefRelationalExpr rvExpr)
368− Left err -> pure (Left err)
320+ exprType' <- case eExprType of
369− Right graphRefPredicate ->
321+ Left err -> throwError err
370− case M.lookup relVarName relVarTable of
322+ Right t -> pure t
371− Nothing -> pure (Left (RelVarNotDefinedError relVarName))
323+ let unrestrictedPortion = Restrict (NotPredicate pred') rvExpr
372− Just existingRvExpr -> do
324+ tmpAttr = tmpAttrC 1
373− let unrestrictedPortion = Restrict (NotPredicate graphRefPredicate) rv
325+ tmpAttrC :: Int -> AttributeName -> AttributeName
374− rv = RelationVariable relVarName transId
326+ tmpAttrC c attr =
375− tmpAttr attr = "_tmp_" <> attr --this could certainly be improved to verify that there is no attribute name conflict
327+ let tmpAttrName = "_tmp_" <> T.pack (show c) <> attr in
328+ if tmpAttrName `S.member` A.attributeNameSet (attributes exprType') then
376− updateAttr nam atomExpr = Extend (AttributeExtendTupleExpr (tmpAttr nam) atomExpr)
332+ updateAttr nam atomExpr = Extend (AttributeExtendTupleExpr (tmpAttr nam) atomExpr)
377− projectAndRename attr expr = Rename (tmpAttr attr) attr (Project (InvertedAttributeNames (S.singleton attr)) expr)
333+ projectAndRename attr expr = Rename (tmpAttr attr) attr (Project (InvertedAttributeNames (S.singleton attr)) expr)
378− restrictedPortion = Restrict graphRefPredicate
334+ restrictedPortion = Restrict pred' rvExpr
379− updated = foldr (\(oldname, atomExpr) accum ->
335+ updated = foldr (\(oldname, atomExpr) accum ->
380− let procAtomExpr = processAtomExpr atomExpr transId in
336+ let procAtomExpr = runProcessExprM UncommittedContextMarker (processAtomExpr atomExpr) in
381 updateAttr oldname procAtomExpr accum
337 updateAttr oldname procAtomExpr accum
382− ) rv (M.toList atomExprMap)
338+ ) restrictedPortion (M.toList atomExprMap)
383 -- the atomExprMap could reference other attributes, so we must perform multi-pass folds
339 -- the atomExprMap could reference other attributes, so we must perform multi-pass folds
384− updatedPortion = foldr projectAndRename updated (M.keys atomExprMap)
340+ updatedPortion = foldr projectAndRename updated (M.keys atomExprMap)
385− setRelVar relVarName (Union unrestrictedPortion updatedPortion) transId graph
341+ setRelVar relVarName (Union unrestrictedPortion updatedPortion)
387−evalDatabaseContextExpr (AddInclusionDependency newDepName newDep) transId graph = do
343+evalGraphRefDatabaseContextExpr (AddInclusionDependency newDepName newDep) = do
388 currContext <- getStateContext
344 currContext <- getStateContext
345+ transId <- dbcTransId
389 let currDeps = inclusionDependencies currContext
347 let currDeps = inclusionDependencies currContext
390 newDeps = M.insert newDepName newDep currDeps
348 newDeps = M.insert newDepName newDep currDeps
391 if M.member newDepName currDeps then
349 if M.member newDepName currDeps then
392− pure (Left (InclusionDependencyNameInUseError newDepName))
350+ dbErr (InclusionDependencyNameInUseError newDepName)
394 let potentialContext = currContext { inclusionDependencies = newDeps }
352 let potentialContext = currContext { inclusionDependencies = newDeps }
353+ -- if the potential context passes all constraints, then save it
354+ -- potential optimization: validate only the new constraint- all old constraints must already hold
395 case checkConstraints potentialContext transId graph of
355 case checkConstraints potentialContext transId graph of
396− Left err -> pure (Left err)
356+ Left err -> dbErr err
397− Right _ -> do
357+ Right _ ->
398 putStateContext potentialContext
358 putStateContext potentialContext
401−evalDatabaseContextExpr (RemoveInclusionDependency depName) _ _ = do
360+evalGraphRefDatabaseContextExpr (RemoveInclusionDependency depName) = do
402 currContext <- getStateContext
361 currContext <- getStateContext
403 let currDeps = inclusionDependencies currContext
362 let currDeps = inclusionDependencies currContext
404 newDeps = M.delete depName currDeps
363 newDeps = M.delete depName currDeps
405 if M.notMember depName currDeps then
364 if M.notMember depName currDeps then
406− pure (Left (InclusionDependencyNameNotInUseError depName))
365+ dbErr (InclusionDependencyNameNotInUseError depName)
408 putStateContext $ currContext {inclusionDependencies = newDeps }
367 putStateContext $ currContext {inclusionDependencies = newDeps }
411-- | Add a notification which will send the resultExpr when triggerExpr changes between commits.
369-- | Add a notification which will send the resultExpr when triggerExpr changes between commits.
412−evalDatabaseContextExpr (AddNotification notName triggerExpr resultOldExpr resultNewExpr) _ _ = do
370+evalGraphRefDatabaseContextExpr (AddNotification notName triggerExpr resultOldExpr resultNewExpr) = do
413 currentContext <- getStateContext
371 currentContext <- getStateContext
414 let nots = notifications currentContext
372 let nots = notifications currentContext
415 if M.member notName nots then
373 if M.member notName nots then
416− pure (Left (NotificationNameInUseError notName))
374+ dbErr (NotificationNameInUseError notName)
418 let newNotifications = M.insert notName newNotification nots
376 let newNotifications = M.insert notName newNotification nots
419 newNotification = Notification { changeExpr = triggerExpr,
377 newNotification = Notification { changeExpr = triggerExpr,
420 reportOldExpr = resultOldExpr,
378 reportOldExpr = resultOldExpr,
421 reportNewExpr = resultNewExpr}
379 reportNewExpr = resultNewExpr}
422 putStateContext $ currentContext { notifications = newNotifications }
380 putStateContext $ currentContext { notifications = newNotifications }
425−evalDatabaseContextExpr (RemoveNotification notName) _ _ = do
382+evalGraphRefDatabaseContextExpr (RemoveNotification notName) = do
426 currentContext <- getStateContext
383 currentContext <- getStateContext
427 let nots = notifications currentContext
384 let nots = notifications currentContext
428 if M.notMember notName nots then
385 if M.notMember notName nots then
429− pure (Left (NotificationNameNotInUseError notName))
386+ dbErr (NotificationNameNotInUseError notName)
431 let newNotifications = M.delete notName nots
388 let newNotifications = M.delete notName nots
432 putStateContext $ currentContext { notifications = newNotifications }
389 putStateContext $ currentContext { notifications = newNotifications }
435-- | Adds type and data constructors to the database context.
392-- | Adds type and data constructors to the database context.
436-- validate that the type *and* constructor names are unique! not yet implemented!
393-- validate that the type *and* constructor names are unique! not yet implemented!
437−evalDatabaseContextExpr (AddTypeConstructor tConsDef dConsDefList) _ _ = do
394+evalGraphRefDatabaseContextExpr (AddTypeConstructor tConsDef dConsDefList) = do
438 currentContext <- getStateContext
395 currentContext <- getStateContext
439 let oldTypes = typeConstructorMapping currentContext
396 let oldTypes = typeConstructorMapping currentContext
440 tConsName = TCD.name tConsDef
397 tConsName = TCD.name tConsDef
441 -- validate that the constructor's types exist
398 -- validate that the constructor's types exist
442− case validateTypeConstructorDef tConsDef dConsDefList of
399+ case validateTypeConstructorDef tConsDef dConsDefList oldTypes of
443− errs@(_:_) -> pure (Left (someErrors errs))
400+ Left err -> throwError err
444− [] | T.null tConsName || not (isUpper (T.head tConsName)) -> pure (Left (InvalidAtomTypeName tConsName))
401+ Right () | T.null tConsName || not (isUpper (T.head tConsName)) -> dbErr (InvalidAtomTypeName tConsName)
445− | isJust (findTypeConstructor tConsName oldTypes) -> pure (Left (AtomTypeNameInUseError tConsName))
402+ | isJust (findTypeConstructor tConsName oldTypes) -> dbErr (AtomTypeNameInUseError tConsName)
446 | otherwise -> do
403 | otherwise -> do
447 let newTypes = oldTypes ++ [(tConsDef, dConsDefList)]
404 let newTypes = oldTypes ++ [(tConsDef, dConsDefList)]
448 putStateContext $ currentContext { typeConstructorMapping = newTypes }
405 putStateContext $ currentContext { typeConstructorMapping = newTypes }
451-- | Removing the atom constructor prevents new atoms of the type from being created. Existing atoms of the type remain. Thus, the atomTypes list in the DatabaseContext need not be all-inclusive.
407-- | Removing the atom constructor prevents new atoms of the type from being created. Existing atoms of the type remain. Thus, the atomTypes list in the DatabaseContext need not be all-inclusive.
452−evalDatabaseContextExpr (RemoveTypeConstructor tConsName) _ _ = do
408+evalGraphRefDatabaseContextExpr (RemoveTypeConstructor tConsName) = do
453 currentContext <- getStateContext
409 currentContext <- getStateContext
454 let oldTypes = typeConstructorMapping currentContext
410 let oldTypes = typeConstructorMapping currentContext
455 if isNothing (findTypeConstructor tConsName oldTypes) then
411 if isNothing (findTypeConstructor tConsName oldTypes) then
456− pure (Left (AtomTypeNameNotInUseError tConsName))
412+ dbErr (AtomTypeNameNotInUseError tConsName)
458 let newTypes = filter (\(tCons, _) -> TCD.name tCons /= tConsName) oldTypes
414 let newTypes = filter (\(tCons, _) -> TCD.name tCons /= tConsName) oldTypes
459 putStateContext $ currentContext { typeConstructorMapping = newTypes }
415 putStateContext $ currentContext { typeConstructorMapping = newTypes }
462−evalDatabaseContextExpr (MultipleExpr exprs) transId graph = do
417+evalGraphRefDatabaseContextExpr (MultipleExpr exprs) =
463 --the multiple expressions must pass the same context around- not the old unmodified context
418 --the multiple expressions must pass the same context around- not the old unmodified context
464− evald <- forM exprs (\expr -> evalDatabaseContextExpr expr transId graph)
419+ mapM_ evalGraphRefDatabaseContextExpr exprs
465− --some lifting magic needed here
420+
467− [] -> pure (Right ())
468− errs -> pure (Left (someErrors errs))
470−evalDatabaseContextExpr (RemoveAtomFunction funcName) _ _ = do
421+evalGraphRefDatabaseContextExpr (RemoveAtomFunction funcName) = do
471 currentContext <- getStateContext
422 currentContext <- getStateContext
472 let atomFuncs = atomFunctions currentContext
423 let atomFuncs = atomFunctions currentContext
473 case atomFunctionForName funcName atomFuncs of
424 case atomFunctionForName funcName atomFuncs of
474− Left err -> pure (Left err)
425+ Left err -> dbErr err
475− Right realFunc -> if isScriptedAtomFunction realFunc then do
427+ if isScriptedAtomFunction realFunc then do
476− let updatedFuncs = HS.delete realFunc atomFuncs
428+ let updatedFuncs = HS.delete realFunc atomFuncs
477− putStateContext (currentContext {atomFunctions = updatedFuncs })
429+ putStateContext (currentContext {atomFunctions = updatedFuncs })
480− pure (Left (PrecompiledFunctionRemoveError funcName))
431+ dbErr (PrecompiledFunctionRemoveError funcName)
482−evalDatabaseContextExpr (RemoveDatabaseContextFunction funcName) _ _ = do
433+evalGraphRefDatabaseContextExpr (RemoveDatabaseContextFunction funcName) = do
483 context <- getStateContext
434 context <- getStateContext
484 let dbcFuncs = dbcFunctions context
435 let dbcFuncs = dbcFunctions context
485 case databaseContextFunctionForName funcName dbcFuncs of
436 case databaseContextFunctionForName funcName dbcFuncs of
486− Left err -> pure (Left err)
437+ Left err -> dbErr err
487− Right realFunc -> if isScriptedDatabaseContextFunction realFunc then do
439+ if isScriptedDatabaseContextFunction realFunc then do
488− let updatedFuncs = HS.delete realFunc dbcFuncs
440+ let updatedFuncs = HS.delete realFunc dbcFuncs
489− putStateContext (context { dbcFunctions = updatedFuncs })
441+ putStateContext (context { dbcFunctions = updatedFuncs })
492− pure (Left (PrecompiledFunctionRemoveError funcName))
443+ dbErr (PrecompiledFunctionRemoveError funcName)
494−evalDatabaseContextExpr (ExecuteDatabaseContextFunction funcName atomArgExprs) _ _ = do
445+evalGraphRefDatabaseContextExpr (ExecuteDatabaseContextFunction funcName atomArgExprs) = do
495 context <- getStateContext
446 context <- getStateContext
496 --resolve atom arguments
448 --resolve atom arguments
497− let relExprState = mkRelationalExprState context
449+ let eAtomTypes = mapM (runGraphRefRelationalExprM gfEnv . typeForGraphRefAtomExpr emptyAttributes) atomArgExprs
498− eAtomTypes = map (\atomExpr -> runReader (typeFromAtomExpr emptyAttributes atomExpr) relExprState) atomArgExprs
499 eFunc = databaseContextFunctionForName funcName (dbcFunctions context)
450 eFunc = databaseContextFunctionForName funcName (dbcFunctions context)
451+ gfEnv = freshGraphRefRelationalExprEnv (Just context) graph
500 case eFunc of
452 case eFunc of
501− Left err -> pure (Left err)
453+ Left err -> dbErr err
502 Right func -> do
454 Right func -> do
503 let expectedArgCount = length (dbcFuncType func)
455 let expectedArgCount = length (dbcFuncType func)
504 actualArgCount = length atomArgExprs
456 actualArgCount = length atomArgExprs
505 if expectedArgCount /= actualArgCount then
457 if expectedArgCount /= actualArgCount then
506− pure (Left (FunctionArgumentCountMismatchError expectedArgCount actualArgCount))
458+ dbErr (FunctionArgumentCountMismatchError expectedArgCount actualArgCount)
508 --check that the atom types are valid
460 --check that the atom types are valid
509− case lefts eAtomTypes of
461+ case eAtomTypes of
510− _:_ -> pure (Left (someErrors (lefts eAtomTypes)))
462+ Left err -> dbErr err
511− [] -> do
463+ Right atomTypes -> do
512− let atomTypes = rights eAtomTypes
464+ let mValidTypes = zipWith (\ expType actType
513− let mValidTypes = map (\(expType, actType) -> case atomTypeVerify expType actType of
465+ -> case atomTypeVerify expType actType of
514− Left err -> Just err
466+ Left err -> Just err
515− Right _ -> Nothing) (zip (dbcFuncType func) atomTypes)
468+ (dbcFuncType func) atomTypes
516− typeErrors = catMaybes mValidTypes
469+ typeErrors = catMaybes mValidTypes
517− eAtomArgs = map (\arg -> runReader (evalAtomExpr emptyTuple arg) relExprState) atomArgExprs
470+ eAtomArgs = map (runGraphRefRelationalExprM gfEnv . evalGraphRefAtomExpr emptyTuple) atomArgExprs
518 if length (lefts eAtomArgs) > 1 then
471 if length (lefts eAtomArgs) > 1 then
519− pure (Left (someErrors (lefts eAtomArgs)))
472+ dbErr (someErrors (lefts eAtomArgs))
520 else if not (null typeErrors) then
473 else if not (null typeErrors) then
521− pure (Left (someErrors typeErrors))
474+ dbErr (someErrors typeErrors)
523 case evalDatabaseContextFunction func (rights eAtomArgs) context of
476 case evalDatabaseContextFunction func (rights eAtomArgs) context of
524− Left err -> pure (Left err)
477+ Left err -> dbErr err
525− Right newContext -> putStateContext newContext >> pure (Right ())
478+ Right newContext -> putStateContext newContext
526−
479+data DatabaseContextIOEvalEnv = DatabaseContextIOEvalEnv
527−evalDatabaseContextIOExpr :: Maybe ScriptSession -> DatabaseContext -> TransactionId -> TransactionGraph -> DatabaseContextIOExpr -> IO (Either RelationalError DatabaseContext)
480+ { dbcio_transId :: TransactionId,
481+ dbcio_graph :: TransactionGraph,
482+ dbcio_mScriptSession :: Maybe ScriptSession
485+type DatabaseContextIOEvalMonad a = RWST DatabaseContextIOEvalEnv () DatabaseContextEvalState IO a
487+runDatabaseContextIOEvalMonad :: DatabaseContextIOEvalEnv -> DatabaseContext -> DatabaseContextIOEvalMonad (Either RelationalError ()) -> IO (Either RelationalError DatabaseContextEvalState)
488+runDatabaseContextIOEvalMonad env ctx m = do
489+ res <- runRWST m env freshState
491+ (Left err,_,_) -> pure (Left err)
492+ (Right (),s,_) -> pure (Right s)
494+ freshState = mkDatabaseContextEvalState ctx
496+requireScriptSession :: DatabaseContextIOEvalMonad (Either RelationalError ScriptSession)
497+requireScriptSession = do
499+ case dbcio_mScriptSession env of
500+ Nothing -> pure $ Left $ ScriptError ScriptCompilationDisabledError
501+ Just ss -> pure (Right ss)
503+putDBCIOContext :: DatabaseContext -> DatabaseContextIOEvalMonad (Either RelationalError ())
504+putDBCIOContext ctx = do
505+ RWS.modify (\dbstate -> dbstate { dbc_context = ctx})
508+getDBCIOContext :: DatabaseContextIOEvalMonad DatabaseContext
509+getDBCIOContext = dbc_context <$> RWS.get
511+getDBCIORelationalExprEnv :: DatabaseContextIOEvalMonad RelationalExprEnv
512+getDBCIORelationalExprEnv = do
513+ context <- getDBCIOContext
514+ mkRelationalExprEnv context . dbcio_graph <$> RWS.ask
516+evalGraphRefDatabaseContextIOExpr :: GraphRefDatabaseContextIOExpr -> DatabaseContextIOEvalMonad (Either RelationalError ())
517+#if !defined(PM36_HASKELL_SCRIPTING)
518+evalGraphRefDatabaseContextIOExpr AddAtomFunction{} = pure (Left (ScriptError ScriptCompilationDisabledError))
519+evalGraphRefDatabaseContextIOExpr AddDatabaseContextFunction{} = pure (Left (ScriptError ScriptCompilationDisabledError))
520+evalGraphRefDatabaseContextIOExpr LoadAtomFunctions{} = pure (Left (ScriptError ScriptCompilationDisabledError))
521+evalGraphRefDatabaseContextIOExpr LoadDatabaseContextFunctions{} = pure (Left (ScriptError ScriptCompilationDisabledError))
528−evalDatabaseContextIOExpr mScriptSession currentContext _ _ (AddAtomFunction funcName funcType script) =
523+evalGraphRefDatabaseContextIOExpr (AddAtomFunction funcName funcType script) = do
529− case mScriptSession of
524+ eScriptSession <- requireScriptSession
530− Nothing -> pure (Left (ScriptError ScriptCompilationDisabledError))
525+ currentContext <- getDBCIOContext
526+ case eScriptSession of
527+ Left err -> pure (Left err)
531− Just scriptSession -> do
528+ Right scriptSession -> do
532− res <- try $ runGhc (Just libdir) $ do
529+ res <- liftIO $ try $ runGhc (Just libdir) $ do
533 setSession (hscEnv scriptSession)
530 setSession (hscEnv scriptSession)
534 let atomFuncs = atomFunctions currentContext
531 let atomFuncs = atomFunctions currentContext
535 case extractAtomFunctionType funcType of
532 case extractAtomFunctionType funcType of
@@ -555,12 +552,13 @@ evalDatabaseContextIOExpr mScriptSession currentContext _ _ (AddAtomFunction fun
555 Left (exc :: SomeException) -> pure $ Left (ScriptError (OtherScriptCompilationError (show exc)))
552 Left (exc :: SomeException) -> pure $ Left (ScriptError (OtherScriptCompilationError (show exc)))
556 Right eContext -> case eContext of
553 Right eContext -> case eContext of
557 Left err -> pure (Left err)
554 Left err -> pure (Left err)
558− Right context' -> pure (Right context')
555+ Right context' -> putDBCIOContext context'
560−evalDatabaseContextIOExpr mScriptSession currentContext _ _ (AddDatabaseContextFunction funcName funcType script) =
556+evalGraphRefDatabaseContextIOExpr (AddDatabaseContextFunction funcName funcType script) = do
561− case mScriptSession of
557+ eScriptSession <- requireScriptSession
562− Nothing -> pure (Left (ScriptError ScriptCompilationDisabledError))
558+ currentContext <- getDBCIOContext
559+ case eScriptSession of
560+ Left err -> pure (Left err)
563− Just scriptSession -> do
561+ Right scriptSession -> do
564 --validate that the function signature is of the form x -> y -> ... -> DatabaseContext -> DatabaseContext
562 --validate that the function signature is of the form x -> y -> ... -> DatabaseContext -> DatabaseContext
565 let last2Args = reverse (take 2 (reverse funcType))
563 let last2Args = reverse (take 2 (reverse funcType))
566 atomArgs = take (length funcType - 2) funcType
564 atomArgs = take (length funcType - 2) funcType
@@ -570,7 +568,7 @@ evalDatabaseContextIOExpr mScriptSession currentContext _ _ (AddDatabaseContextF
570 if last2Args /= [ADTypeConstructor "DatabaseContext" [], dbContextTypeCons] then
568 if last2Args /= [ADTypeConstructor "DatabaseContext" [], dbContextTypeCons] then
571 pure (Left (ScriptError (TypeCheckCompilationError expectedType actualType)))
569 pure (Left (ScriptError (TypeCheckCompilationError expectedType actualType)))
573− res <- try $ runGhc (Just libdir) $ do
571+ res <- liftIO $ try $ runGhc (Just libdir) $ do
574 setSession (hscEnv scriptSession)
572 setSession (hscEnv scriptSession)
575 eCompiledFunc <- compileScript (dbcFunctionBodyType scriptSession) script
573 eCompiledFunc <- compileScript (dbcFunctionBodyType scriptSession) script
576 pure $ case eCompiledFunc of
574 pure $ case eCompiledFunc of
@@ -595,78 +593,86 @@ evalDatabaseContextIOExpr mScriptSession currentContext _ _ (AddDatabaseContextF
595 Left (exc :: SomeException) -> pure $ Left (ScriptError (OtherScriptCompilationError (show exc)))
593 Left (exc :: SomeException) -> pure $ Left (ScriptError (OtherScriptCompilationError (show exc)))
596 Right eContext -> case eContext of
594 Right eContext -> case eContext of
597 Left err -> pure (Left err)
595 Left err -> pure (Left err)
598− Right context' -> pure (Right context')
596+ Right context' -> putDBCIOContext context'
599−evalDatabaseContextIOExpr _ currentContext _ _ (LoadAtomFunctions modName funcName modPath) = do
597+evalGraphRefDatabaseContextIOExpr (LoadAtomFunctions modName funcName modPath) = do
598+ currentContext <- getDBCIOContext
600− eLoadFunc <- loadAtomFunctions (T.unpack modName) (T.unpack funcName) modPath
599+ eLoadFunc <- liftIO $ loadAtomFunctions (T.unpack modName) (T.unpack funcName) modPath
601 case eLoadFunc of
600 case eLoadFunc of
602 Left LoadSymbolError -> pure (Left LoadFunctionError)
601 Left LoadSymbolError -> pure (Left LoadFunctionError)
603 Right atomFunctionListFunc -> let newContext = currentContext { atomFunctions = mergedFuncs }
602 Right atomFunctionListFunc -> let newContext = currentContext { atomFunctions = mergedFuncs }
604 mergedFuncs = HS.union (atomFunctions currentContext) (HS.fromList atomFunctionListFunc)
603 mergedFuncs = HS.union (atomFunctions currentContext) (HS.fromList atomFunctionListFunc)
605− in pure (Right newContext)
604+ in putDBCIOContext newContext
606−evalDatabaseContextIOExpr _ currentContext _ _ (LoadDatabaseContextFunctions modName funcName modPath) = do
605+evalGraphRefDatabaseContextIOExpr (LoadDatabaseContextFunctions modName funcName modPath) = do
606+ currentContext <- getDBCIOContext
607− eLoadFunc <- loadDatabaseContextFunctions (T.unpack modName) (T.unpack funcName) modPath
607+ eLoadFunc <- liftIO $ loadDatabaseContextFunctions (T.unpack modName) (T.unpack funcName) modPath
608 case eLoadFunc of
608 case eLoadFunc of
609 Left LoadSymbolError -> pure (Left LoadFunctionError)
609 Left LoadSymbolError -> pure (Left LoadFunctionError)
610 Right dbcListFunc -> let newContext = currentContext { dbcFunctions = mergedFuncs }
610 Right dbcListFunc -> let newContext = currentContext { dbcFunctions = mergedFuncs }
611 mergedFuncs = HS.union (dbcFunctions currentContext) (HS.fromList dbcListFunc)
611 mergedFuncs = HS.union (dbcFunctions currentContext) (HS.fromList dbcListFunc)
612− in pure (Right newContext)
612+ in putDBCIOContext newContext
614−evalDatabaseContextIOExpr _ currentContext transId graph (CreateArbitraryRelation relVarName attrExprs range) =
614+evalGraphRefDatabaseContextIOExpr (CreateArbitraryRelation relVarName attrExprs range) = do
616− case runState (evalDatabaseContextExpr (Define relVarName attrExprs) transId graph) (freshDatabaseState currentContext) of
616+ currentContext <- getDBCIOContext
618+ --create graph ref expr
619+ let gfExpr = Define relVarName attrExprs
620+ evalEnv = mkDatabaseContextEvalEnv (dbcio_transId env) (dbcio_graph env)
621+ graph = dbcio_graph env
622+ case runDatabaseContextEvalMonad currentContext evalEnv (evalGraphRefDatabaseContextExpr gfExpr) of
617− (Left err,_) -> pure (Left err)
623+ Left err -> pure (Left err)
618− (Right (), elems) -> do
624+ Right dbstate -> do
620 let existingRelVar = M.lookup relVarName relVarTable
626 let existingRelVar = M.lookup relVarName relVarTable
621− relVarTable = relationVariables (context elems)
627+ relVarTable = relationVariables (dbc_context dbstate)
622 case existingRelVar of
628 case existingRelVar of
623 Nothing -> pure $ Left (RelVarNotDefinedError relVarName)
629 Nothing -> pure $ Left (RelVarNotDefinedError relVarName)
624 Just existingRel -> do
630 Just existingRel -> do
631+ let gfEnv = freshGraphRefRelationalExprEnv (Just currentContext) graph
625− case typeForGraphRefRelationalExpr existingRel graph of
632+ case runGraphRefRelationalExprM gfEnv (typeForGraphRefRelationalExpr existingRel) of
626 Left err -> pure (Left err)
633 Left err -> pure (Left err)
627 Right relType -> do
634 Right relType -> do
628 let expectedAttributes = attributes relType
635 let expectedAttributes = attributes relType
629− tcMap = typeConstructorMapping (context elems)
636+ tcMap = typeConstructorMapping (dbc_context dbstate)
630− eitherRel <- generate $ runReaderT (arbitraryRelation expectedAttributes range) tcMap
637+ eitherRel <- liftIO $ generate $ runReaderT (arbitraryRelation expectedAttributes range) tcMap
631 case eitherRel of
638 case eitherRel of
632 Left err -> pure $ Left err
639 Left err -> pure $ Left err
633 Right rel ->
640 Right rel ->
634− case runState (setRelVar relVarName (ExistingRelation rel) transId graph) elems of
641+ case runDatabaseContextEvalMonad currentContext evalEnv (setRelVar relVarName (ExistingRelation rel)) of
635− (Left err,_) -> pure (Left err)
642+ Left err -> pure (Left err)
636− (Right (), elems') -> pure $ Right (context elems)
643+ Right dbstate' -> putDBCIOContext (dbc_context dbstate')
638−updateTupleWithAtomExprs :: M.Map AttributeName AtomExpr -> DatabaseContext -> RelationTuple -> Either RelationalError RelationTuple
639−updateTupleWithAtomExprs exprMap context tupIn = do
640− --resolve all atom exprs
641− atomsAssoc <- mapM (\(attrName, atomExpr) -> do
642− atom <- runReader (evalAtomExpr tupIn atomExpr) (RelationalExprStateElems context)
643− pure (attrName, atom)
644− ) (M.toList exprMap)
645− pure (updateTupleWithAtoms (M.fromList atomsAssoc) tupIn)
647--run verification on all constraints
645--run verification on all constraints
648checkConstraints :: DatabaseContext -> TransactionId -> TransactionGraph -> Either RelationalError ()
646checkConstraints :: DatabaseContext -> TransactionId -> TransactionGraph -> Either RelationalError ()
649−checkConstraints context transId graph@(TransactionGraph graphHeads transSet) =
647+checkConstraints context transId graph@(TransactionGraph graphHeads transSet) = do
650 mapM_ (uncurry checkIncDep) (M.toList deps)
648 mapM_ (uncurry checkIncDep) (M.toList deps)
652 potentialGraph = TransactionGraph graphHeads (S.insert tempTrans transSet)
650 potentialGraph = TransactionGraph graphHeads (S.insert tempTrans transSet)
653 tempStamp = UTCTime { utctDay = fromGregorian 2000 1 1,
651 tempStamp = UTCTime { utctDay = fromGregorian 2000 1 1,
654 utctDayTime = secondsToDiffTime 0 }
652 utctDayTime = secondsToDiffTime 0 }
655 tempSchemas = Schemas context M.empty
653 tempSchemas = Schemas context M.empty
654+ tempTrans = Transaction U.nil tempTransInfo tempSchemas
656− tempTrans = Transaction U.nil (TransactionInfo (transId NE.:| []) tempStamp) tempSchemas
655+ tempTransInfo = TransactionInfo { parents = transId NE.:| [],
658 deps = inclusionDependencies context
660 deps = inclusionDependencies context
659− eval expr = evalReader (evalRelationalExpr expr)
661+ -- no optimization available here, really? perhaps the optimizer should be passed down to here or the eval function should be passed through the environment
660− evalReader f = runReader f (RelationalExprStateElems context)
661 checkIncDep depName (InclusionDependency subsetExpr supersetExpr) = do
662 checkIncDep depName (InclusionDependency subsetExpr supersetExpr) = do
663+ let process = runProcessExprM UncommittedContextMarker
662− let gfSubsetExpr = processRelationalExpr subsetExpr transId
664+ gfSubsetExpr = process (processRelationalExpr subsetExpr)
663− gfSupersetExpr = processRelationalExpr supersetExpr transId
665+ gfSupersetExpr = process (processRelationalExpr supersetExpr)
664 --if both expressions are of a single-attribute (such as with a simple foreign key), the names of the attributes are irrelevant (they need not match) because the expression is unambiguous, but special-casing this to rename the attribute automatically would not be orthogonal behavior and probably cause confusion. Instead, special case the error to make it clear.
666 --if both expressions are of a single-attribute (such as with a simple foreign key), the names of the attributes are irrelevant (they need not match) because the expression is unambiguous, but special-casing this to rename the attribute automatically would not be orthogonal behavior and probably cause confusion. Instead, special case the error to make it clear.
665− typeSub <- evalReader (typeForRelationalExpr subsetExpr transId graph)
667+ let gfEnv = freshGraphRefRelationalExprEnv (Just context) graph
666− typeSuper <- evalReader (typeForRelationalExpr supersetExpr transId graph)
668+ runGfRel = runGraphRefRelationalExprM gfEnv
669+ typeSub <- runGfRel (typeForGraphRefRelationalExpr gfSubsetExpr)
670+ typeSuper <- runGfRel (typeForGraphRefRelationalExpr gfSupersetExpr)
667 when (typeSub /= typeSuper) (Left (RelationTypeMismatchError (attributes typeSub) (attributes typeSuper)))
671 when (typeSub /= typeSuper) (Left (RelationTypeMismatchError (attributes typeSub) (attributes typeSuper)))
668 let checkExpr = Equals gfSupersetExpr (Union gfSubsetExpr gfSupersetExpr)
672 let checkExpr = Equals gfSupersetExpr (Union gfSubsetExpr gfSupersetExpr)
669− case evalGraphRefRelationalExpr checkExpr potentialGraph of
673+ gfEvald = runGraphRefRelationalExprM gfEnv' (evalGraphRefRelationalExpr checkExpr)
674+ gfEnv' = freshGraphRefRelationalExprEnv (Just context) potentialGraph
670 Left err -> Left err
676 Left err -> Left err
671 Right resultRel -> if resultRel == relationTrue then
677 Right resultRel -> if resultRel == relationTrue then
@@ -676,90 +682,81 @@ checkConstraints context transId graph@(TransactionGraph graphHeads transSet) =
676-- the type of a relational expression is equal to the relation attribute set returned from executing the relational expression; therefore, the type can be cheaply derived by evaluating a relational expression and ignoring and tuple processing
682-- the type of a relational expression is equal to the relation attribute set returned from executing the relational expression; therefore, the type can be cheaply derived by evaluating a relational expression and ignoring and tuple processing
677-- furthermore, the type of a relational expression is the resultant header of the evaluated empty-tupled relation
683-- furthermore, the type of a relational expression is the resultant header of the evaluated empty-tupled relation
679−typeForRelationalExpr :: RelationalExpr -> TransactionId -> TransactionGraph -> RelationalExprState (Either RelationalError Relation)
685+typeForRelationalExpr :: RelationalExpr -> RelationalExprM Relation
680−typeForRelationalExpr expr transId graph = do
686+typeForRelationalExpr expr = do
682− let context = stateElemsContext rstate
683 --replace the relationVariables context element with a cloned set of relation devoid of tuples
687 --replace the relationVariables context element with a cloned set of relation devoid of tuples
684 --evalRelationalExpr could still return an existing relation with tuples, so strip them
688 --evalRelationalExpr could still return an existing relation with tuples, so strip them
690+ context <- reContext
685− let gfExpr = processRelationalExpr expr transId
691+ let gfExpr = runProcessExprM UncommittedContextMarker (processRelationalExpr expr)
692+ gfEnv = freshGraphRefRelationalExprEnv (Just context) graph
686− pure (typeForGraphRefRelationalExpr gfExpr graph)
693+ runGf = runGraphRefRelationalExprM gfEnv (typeForGraphRefRelationalExpr gfExpr)
687−
694+ lift $ except runGf
688−--returns a database context with all tuples removed
689−--this is useful for type checking and optimization
691−contextWithEmptyTupleSets :: DatabaseContext -> DatabaseContext
692−contextWithEmptyTupleSets contextIn = contextIn { relationVariables = relVars }
694− relVars = M.map (\rel -> ExistingRelation (Relation (attributes rel) emptyTupleSet)) (relationVariables contextIn)
697liftE :: (Monad m) => m (Either a b) -> ExceptT a m b
696liftE :: (Monad m) => m (Either a b) -> ExceptT a m b
698liftE v = do
697liftE v = do
699 y <- lift v
698 y <- lift v
700 case y of
699 case y of
701− Left err -> throwE err
700+ Left err -> throwError err
702 Right val -> pure val
701 Right val -> pure val
704{- used for restrictions- take the restrictionpredicate and return the corresponding filter function -}
703{- used for restrictions- take the restrictionpredicate and return the corresponding filter function -}
705−predicateRestrictionFilter :: Attributes -> RestrictionPredicateExprBase a -> RelationalExprState (Either RelationalError RestrictionFilter)
704+predicateRestrictionFilter :: Attributes -> GraphRefRestrictionPredicateExpr -> GraphRefRelationalExprM RestrictionFilter
706−predicateRestrictionFilter attrs (AndPredicate expr1 expr2) =
705+predicateRestrictionFilter attrs (AndPredicate expr1 expr2) = do
708− expr1v <- liftE (predicateRestrictionFilter attrs expr1)
706+ expr1v <- predicateRestrictionFilter attrs expr1
709− expr2v <- liftE (predicateRestrictionFilter attrs expr2)
707+ expr2v <- predicateRestrictionFilter attrs expr2
710− pure (\x -> do
708+ pure (\x -> do
711− ev1 <- expr1v x
709+ ev1 <- expr1v x
712− ev2 <- expr2v x
710+ ev2 <- expr2v x
713− pure (ev1 && ev2))
711+ pure (ev1 && ev2))
715−predicateRestrictionFilter attrs (OrPredicate expr1 expr2) =
713+predicateRestrictionFilter attrs (OrPredicate expr1 expr2) = do
717− expr1v <- liftE (predicateRestrictionFilter attrs expr1)
714+ expr1v <- predicateRestrictionFilter attrs expr1
718− expr2v <- liftE (predicateRestrictionFilter attrs expr2)
715+ expr2v <- predicateRestrictionFilter attrs expr2
719 pure (\x -> do
716 pure (\x -> do
720 ev1 <- expr1v x
717 ev1 <- expr1v x
721 ev2 <- expr2v x
718 ev2 <- expr2v x
722 pure (ev1 || ev2))
719 pure (ev1 || ev2))
724−predicateRestrictionFilter _ TruePredicate = pure (Right (\_ -> pure True))
721+predicateRestrictionFilter _ TruePredicate = pure (\_ -> pure True)
726−predicateRestrictionFilter attrs (NotPredicate expr) =
723+predicateRestrictionFilter attrs (NotPredicate expr) = do
728− exprv <- liftE (predicateRestrictionFilter attrs expr)
724+ exprv <- predicateRestrictionFilter attrs expr
729− pure (fmap not . exprv)
725+ pure (fmap not . exprv)
731--optimization opportunity: if the subexpression does not reference attributes in the top-level expression, then it need only be evaluated once, statically, outside the tuple filter- see historical implementation here
727--optimization opportunity: if the subexpression does not reference attributes in the top-level expression, then it need only be evaluated once, statically, outside the tuple filter- see historical implementation here
732predicateRestrictionFilter _ (RelationalExprPredicate relExpr) = do
728predicateRestrictionFilter _ (RelationalExprPredicate relExpr) = do
733− rstate <- ask
729+ renv <- askEnv
734− pure (Right (\tup -> case runReader (evalRelationalExpr relExpr) (mergeTuplesIntoRelationalExprState tup rstate) of
730+ let eval :: RelationTuple -> Either RelationalError Relation
732+ let gfEnv = mergeTuplesIntoGraphRefRelationalExprEnv tup renv in
733+ runGraphRefRelationalExprM gfEnv (evalGraphRefRelationalExpr relExpr)
734+ pure (\tup -> case eval tup of
735 Left err -> Left err
735 Left err -> Left err
736 Right rel -> if arity rel /= 0 then
736 Right rel -> if arity rel /= 0 then
737 Left (PredicateExpressionError "Relational restriction filter must evaluate to 'true' or 'false'")
737 Left (PredicateExpressionError "Relational restriction filter must evaluate to 'true' or 'false'")
739− pure (rel == relationTrue)))
739+ pure (rel == relationTrue))
741predicateRestrictionFilter attrs (AttributeEqualityPredicate attrName atomExpr) = do
741predicateRestrictionFilter attrs (AttributeEqualityPredicate attrName atomExpr) = do
742− rstate <- ask
742+ env <- askEnv
743− let (attrs', ctxtup') = case rstate of
743+ let attrs' = A.union attrs (envAttributes env)
744− RelationalExprStateElems _ -> (attrs, emptyTuple)
744+ ctxtup' = envTuple env
745− RelationalExprStateAttrsElems _ _ -> (attrs, emptyTuple)
746− RelationalExprStateTupleElems _ ctxtup -> (A.union attrs (tupleAttributes ctxtup), ctxtup)
748− atomExprType <- liftE (typeFromAtomExpr attrs' atomExpr)
745+ atomExprType <- typeForGraphRefAtomExpr attrs' atomExpr
749− attr <- either throwE pure $ case A.attributeForName attrName attrs of
746+ attr <- lift $ except $ case A.attributeForName attrName attrs of
750 Right attr -> Right attr
747 Right attr -> Right attr
751 Left (NoSuchAttributeNamesError _) -> case A.attributeForName attrName (tupleAttributes ctxtup') of
748 Left (NoSuchAttributeNamesError _) -> case A.attributeForName attrName (tupleAttributes ctxtup') of
752 Right ctxattr -> Right ctxattr
749 Right ctxattr -> Right ctxattr
753 Left err2@(NoSuchAttributeNamesError _) -> Left err2
750 Left err2@(NoSuchAttributeNamesError _) -> Left err2
754 Left err -> Left err
751 Left err -> Left err
755 Left err -> Left err
752 Left err -> Left err
756− if atomExprType /= A.atomType attr then
753+ if atomExprType /= A.atomType attr then
757− throwE (TupleAttributeTypeMismatchError (A.attributesFromList [attr]))
754+ throwError (TupleAttributeTypeMismatchError (A.attributesFromList [attr]))
759 pure $ \tupleIn -> let evalAndCmp atomIn = case atomEvald of
756 pure $ \tupleIn -> let evalAndCmp atomIn = case atomEvald of
760 Right atomCmp -> atomCmp == atomIn
757 Right atomCmp -> atomCmp == atomIn
761 Left _ -> False
758 Left _ -> False
762− atomEvald = runReader (evalAtomExpr tupleIn atomExpr) rstate
759+ atomEvald = runGraphRefRelationalExprM env (evalGraphRefAtomExpr tupleIn atomExpr)
764 pure $ case atomForAttributeName attrName tupleIn of
761 pure $ case atomForAttributeName attrName tupleIn of
765 Left (NoSuchAttributeNamesError _) -> case atomForAttributeName attrName ctxtup' of
762 Left (NoSuchAttributeNamesError _) -> case atomForAttributeName attrName ctxtup' of
@@ -770,16 +767,15 @@ predicateRestrictionFilter attrs (AttributeEqualityPredicate attrName atomExpr)
770-- in the future, it would be useful to do typechecking on the attribute and atom expr filters in advance
767-- in the future, it would be useful to do typechecking on the attribute and atom expr filters in advance
771predicateRestrictionFilter attrs (AtomExprPredicate atomExpr) = do
768predicateRestrictionFilter attrs (AtomExprPredicate atomExpr) = do
772 --merge attrs into the state attributes
769 --merge attrs into the state attributes
773− rstate <- ask
770+ renv <- askEnv
775− aType <- liftE (typeFromAtomExpr attrs atomExpr)
771+ aType <- typeForGraphRefAtomExpr attrs atomExpr
776− if aType /= BoolAtomType then
772+ if aType /= BoolAtomType then
777− throwE (AtomTypeMismatchError aType BoolAtomType)
773+ throwError (AtomTypeMismatchError aType BoolAtomType)
779 pure (\tupleIn ->
775 pure (\tupleIn ->
780− case runReader (evalAtomExpr tupleIn atomExpr) rstate of
776+ case runGraphRefRelationalExprM renv (evalGraphRefAtomExpr tupleIn atomExpr) of
781− Left err -> Left err
777+ Left err -> Left err
782− Right boolAtomValue -> pure (boolAtomValue == BoolAtom True))
778+ Right boolAtomValue -> pure (boolAtomValue == BoolAtom True))
784tupleExprCheckNewAttrName :: AttributeName -> Relation -> Either RelationalError Relation
780tupleExprCheckNewAttrName :: AttributeName -> Relation -> Either RelationalError Relation
785tupleExprCheckNewAttrName attrName rel = if isRight (attributeForName attrName rel) then
781tupleExprCheckNewAttrName attrName rel = if isRight (attributeForName attrName rel) then
@@ -787,249 +783,311 @@ tupleExprCheckNewAttrName attrName rel = if isRight (attributeForName attrName r
788 Right rel
784 Right rel
790−extendTupleExpressionProcessor :: Relation -> ExtendTupleExpr -> RelationalExprState (Either RelationalError (Attributes, RelationTuple -> Either RelationalError RelationTuple))
786+extendGraphRefTupleExpressionProcessor :: Relation -> GraphRefExtendTupleExpr -> GraphRefRelationalExprM (Attributes, RelationTuple -> Either RelationalError RelationTuple)
791−extendTupleExpressionProcessor relIn (AttributeExtendTupleExpr newAttrName atomExpr) = do
787+extendGraphRefTupleExpressionProcessor relIn (AttributeExtendTupleExpr newAttrName atomExpr) =
792− rstate <- ask
788+-- renv <- askEnv
793 -- check that the attribute name is not in use
789 -- check that the attribute name is not in use
794 case tupleExprCheckNewAttrName newAttrName relIn of
790 case tupleExprCheckNewAttrName newAttrName relIn of
795− Left err -> pure (Left err)
791+ Left err -> throwError err
796− Right _ -> runExceptT $ do
792+ Right _ -> do
797− atomExprType <- liftE (typeFromAtomExpr (attributes relIn) atomExpr)
793+ atomExprType <- typeForGraphRefAtomExpr (attributes relIn) atomExpr
798− atomExprType' <- liftE (verifyAtomExprTypes relIn atomExpr atomExprType)
794+ atomExprType' <- verifyGraphRefAtomExprTypes relIn atomExpr atomExprType
799 let newAttrs = A.attributesFromList [Attribute newAttrName atomExprType']
795 let newAttrs = A.attributesFromList [Attribute newAttrName atomExprType']
800 newAndOldAttrs = A.addAttributes (attributes relIn) newAttrs
796 newAndOldAttrs = A.addAttributes (attributes relIn) newAttrs
801− pure (newAndOldAttrs, \tup -> let substate = mergeTuplesIntoRelationalExprState tup rstate in case runReader (evalAtomExpr tup atomExpr) substate of
797+ env <- ask
802− Left err -> Left err
798+ pure (newAndOldAttrs, \tup -> do
799+ let gfEnv = mergeTuplesIntoGraphRefRelationalExprEnv tup env
800+ atom <- runGraphRefRelationalExprM gfEnv (evalGraphRefAtomExpr tup atomExpr)
803− Right atom -> Right (tupleAtomExtend newAttrName atom tup)
801+ Right (tupleAtomExtend newAttrName atom tup)
806−evalAtomExpr :: RelationTuple -> AtomExpr -> RelationalExprState (Either RelationalError Atom)
804+evalGraphRefAtomExpr :: RelationTuple -> GraphRefAtomExpr -> GraphRefRelationalExprM Atom
805+evalGraphRefAtomExpr tupIn (AttributeAtomExpr attrName) =
807−evalAtomExpr tupIn (AttributeAtomExpr attrName) = case atomForAttributeName attrName tupIn of
806+ case atomForAttributeName attrName tupIn of
808− Right atom -> pure (Right atom)
807+ Right atom -> pure atom
809− err@(Left (NoSuchAttributeNamesError _)) -> do
808+ Left err@(NoSuchAttributeNamesError _) -> do
810− rstate <- ask
809+ env <- askEnv
811− case rstate of
810+ case gre_extra env of
812− RelationalExprStateElems _ -> pure err
811+ Nothing -> throwError err
813− RelationalExprStateAttrsElems _ _ -> pure err
814− RelationalExprStateTupleElems _ ctxtup -> pure (atomForAttributeName attrName ctxtup)
812+ Just (Left ctxtup) -> lift $ except $ atomForAttributeName attrName ctxtup
813+ Just (Right _) -> throwError err
815− Left err -> pure (Left err)
814+ Left err -> throwError err
816−evalAtomExpr _ (NakedAtomExpr atom) = pure (Right atom)
815+evalGraphRefAtomExpr _ (NakedAtomExpr atom) = pure atom
817−evalAtomExpr tupIn (FunctionAtomExpr funcName arguments ()) = do
816+evalGraphRefAtomExpr tupIn (FunctionAtomExpr funcName arguments tid) = do
818− argTypes <- mapM (typeFromAtomExpr (tupleAttributes tupIn)) arguments
817+ argTypes <- mapM (typeForGraphRefAtomExpr (tupleAttributes tupIn)) arguments
819− context <- fmap stateElemsContext ask
818+ context <- gfDatabaseContextForMarker tid
821− let functions = atomFunctions context
819+ let functions = atomFunctions context
822− func <- either throwE pure (atomFunctionForName funcName functions)
820+ func <- lift $ except (atomFunctionForName funcName functions)
823− let expectedArgCount = length (atomFuncType func) - 1
821+ let expectedArgCount = length (atomFuncType func) - 1
824− actualArgCount = length argTypes
822+ actualArgCount = length argTypes
825− safeInit [] = [] -- different behavior from normal init
823+ safeInit [] = [] -- different behavior from normal init
826− safeInit xs = init xs
824+ safeInit xs = init xs
827− if expectedArgCount /= actualArgCount then
825+ if expectedArgCount /= actualArgCount then
828− throwE (FunctionArgumentCountMismatchError expectedArgCount actualArgCount)
826+ throwError (FunctionArgumentCountMismatchError expectedArgCount actualArgCount)
830 let zippedArgs = zip (safeInit (atomFuncType func)) argTypes
828 let zippedArgs = zip (safeInit (atomFuncType func)) argTypes
831− mapM_ (\(expType, eActType) -> do
829+ mapM_ (\(expType, actType) ->
832− actType <- either throwE pure eActType
833− either throwE pure (atomTypeVerify expType actType)) zippedArgs
830+ lift $ except (atomTypeVerify expType actType)) zippedArgs
834− evaldArgs <- mapM (liftE . evalAtomExpr tupIn) arguments
831+ evaldArgs <- mapM (evalGraphRefAtomExpr tupIn) arguments
835 case evalAtomFunction func evaldArgs of
832 case evalAtomFunction func evaldArgs of
836− Left err -> throwE (AtomFunctionUserError err)
833+ Left err -> throwError (AtomFunctionUserError err)
837 Right result -> do
834 Right result -> do
838 --validate that the result matches the expected type
835 --validate that the result matches the expected type
839− _ <- either throwE pure (atomTypeVerify (last (atomFuncType func)) (atomTypeForAtom result))
836+ _ <- lift $ except (atomTypeVerify (last (atomFuncType func)) (atomTypeForAtom result))
840 pure result
837 pure result
841−evalAtomExpr tupIn (RelationAtomExpr relExpr) = do
838+evalGraphRefAtomExpr tupIn (RelationAtomExpr relExpr) = do
842 --merge existing state tuple context into new state tuple context to support an arbitrary number of levels, but new attributes trounce old attributes
839 --merge existing state tuple context into new state tuple context to support an arbitrary number of levels, but new attributes trounce old attributes
843− rstate <- ask
840+ env <- ask
844− runExceptT $ do
841+ let gfEnv = mergeTuplesIntoGraphRefRelationalExprEnv tupIn env
845− let newState = mergeTuplesIntoRelationalExprState tupIn rstate
842+ relAtom <- lift $ except $ runGraphRefRelationalExprM gfEnv (evalGraphRefRelationalExpr relExpr)
846− relAtom <- either throwE pure (runReader (evalRelationalExpr relExpr) newState)
847− pure (RelationAtom relAtom)
843+ pure (RelationAtom relAtom)
848−evalAtomExpr tupIn cons@(ConstructedAtomExpr dConsName dConsArgs ()) = runExceptT $ do
844+evalGraphRefAtomExpr tupIn cons@(ConstructedAtomExpr dConsName dConsArgs _) = do --why is the tid unused here? suspicious
849− rstate <- lift ask
845+ let mergeEnv = mergeTuplesIntoGraphRefRelationalExprEnv tupIn
850− let newState = mergeTuplesIntoRelationalExprState tupIn rstate
851− aType <- either throwE pure (runReader (typeFromAtomExpr (tupleAttributes tupIn) cons) newState)
846+ aType <- local mergeEnv (typeForGraphRefAtomExpr (tupleAttributes tupIn) cons)
852− argAtoms <- mapM (\arg -> either throwE pure (runReader (evalAtomExpr tupIn arg) newState)) dConsArgs
847+ argAtoms <- local mergeEnv $
848+ mapM (evalGraphRefAtomExpr tupIn) dConsArgs
853 pure (ConstructedAtom dConsName aType argAtoms)
849 pure (ConstructedAtom dConsName aType argAtoms)
855−typeFromAtomExpr :: Attributes -> AtomExpr -> RelationalExprState (Either RelationalError AtomType)
851+typeForGraphRefAtomExpr :: Attributes -> GraphRefAtomExpr -> GraphRefRelationalExprM AtomType
856−typeFromAtomExpr attrs (AttributeAtomExpr attrName) = do
852+typeForGraphRefAtomExpr attrs (AttributeAtomExpr attrName) = do
857− rstate <- ask
853+ renv <- askEnv
858 case A.atomTypeForAttributeName attrName attrs of
854 case A.atomTypeForAttributeName attrName attrs of
859− Right aType -> pure (Right aType)
855+ Right aType -> pure aType
860− Left err@(NoSuchAttributeNamesError _) -> case rstate of
856+ Left err@(NoSuchAttributeNamesError _) ->
857+ let envTup = envTuple renv
858+ envAttrs = envAttributes renv in
861− RelationalExprStateAttrsElems _ attrs' -> case A.attributeForName attrName attrs' of
859+ case A.attributeForName attrName envAttrs of
862− Left err' -> pure (Left err')
863− Right attr -> pure (Right (A.atomType attr))
860+ Right attr -> pure (A.atomType attr)
864− RelationalExprStateElems _ -> pure (Left err)
865− RelationalExprStateTupleElems _ tup -> case atomForAttributeName attrName tup of
861+ Left _ -> case atomForAttributeName attrName envTup of
866− Left err' -> pure (Left err')
862+ Right atom -> pure (atomTypeForAtom atom)
867− Right atom -> pure (Right (atomTypeForAtom atom))
863+ Left _ -> --throwError (traceStack (show ("typeForGRAtomExpr", attrs, envTup)) err)
868− Left err -> pure (Left err)
865+ Left err -> throwError err
869−typeFromAtomExpr _ (NakedAtomExpr atom) = pure (Right (atomTypeForAtom atom))
867+typeForGraphRefAtomExpr _ (NakedAtomExpr atom) = pure (atomTypeForAtom atom)
870−typeFromAtomExpr attrs (FunctionAtomExpr funcName atomArgs _) = do
868+typeForGraphRefAtomExpr attrs (FunctionAtomExpr funcName atomArgs transId) = do
871− context <- fmap stateElemsContext ask
869+ funcs <- atomFunctions <$> gfDatabaseContextForMarker transId
872− let funcs = atomFunctions context
873 case atomFunctionForName funcName funcs of
870 case atomFunctionForName funcName funcs of
874− Left err -> pure (Left err)
871+ Left err -> throwError err
875 Right func -> do
872 Right func -> do
876 let funcRetType = last (atomFuncType func)
873 let funcRetType = last (atomFuncType func)
877 funcArgTypes = init (atomFuncType func)
874 funcArgTypes = init (atomFuncType func)
878− eArgTypes <- mapM (typeFromAtomExpr attrs) atomArgs
875+ argTypes <- mapM (typeForGraphRefAtomExpr attrs) atomArgs
879− case lefts eArgTypes of
880− errs@(_:_) -> pure (Left (someErrors errs))
882− let eTvMap = resolveTypeVariables funcArgTypes argTypes
876+ let eTvMap = resolveTypeVariables funcArgTypes argTypes
883− argTypes = rights eArgTypes
884− case eTvMap of
877+ case eTvMap of
885− Left err -> pure (Left err)
878+ Left err -> throwError err
886− Right tvMap -> pure (resolveFunctionReturnValue funcName tvMap funcRetType)
879+ Right tvMap -> lift $ except $ resolveFunctionReturnValue funcName tvMap funcRetType
887−typeFromAtomExpr attrs (RelationAtomExpr relExpr) = runExceptT $ do
880+typeForGraphRefAtomExpr attrs (RelationAtomExpr relExpr) = do
888− rstate <- lift ask
881+ relType <- R.local (mergeAttributesIntoGraphRefRelationalExprEnv attrs) (typeForGraphRefRelationalExpr relExpr)
889− relType <- either throwE pure (runReader (typeForRelationalExpr relExpr) (mergeAttributesIntoRelationalExprState attrs rstate))
890 pure (RelationAtomType (attributes relType))
882 pure (RelationAtomType (attributes relType))
891-- grab the type of the data constructor, then validate that the args match the expected types
883-- grab the type of the data constructor, then validate that the args match the expected types
892−typeFromAtomExpr attrs (ConstructedAtomExpr dConsName dConsArgs _) =
884+typeForGraphRefAtomExpr attrs (ConstructedAtomExpr dConsName dConsArgs tid) =
893− runExceptT $ do
885+ do
894− argsTypes <- mapM (liftE . typeFromAtomExpr attrs) dConsArgs
886+ argsTypes <- mapM (typeForGraphRefAtomExpr attrs) dConsArgs
895− context <- fmap stateElemsContext (lift ask)
887+ tConsMap <- typeConstructorMapping <$> gfDatabaseContextForMarker tid
896− either throwE pure (atomTypeForDataConstructor (typeConstructorMapping context) dConsName argsTypes)
888+ lift $ except $ atomTypeForDataConstructor tConsMap dConsName argsTypes
898-- | Validate that the type of the AtomExpr matches the expected type.
890-- | Validate that the type of the AtomExpr matches the expected type.
899−verifyAtomExprTypes :: Relation -> AtomExpr -> AtomType -> RelationalExprState (Either RelationalError AtomType)
891+verifyGraphRefAtomExprTypes :: Relation -> GraphRefAtomExpr -> AtomType -> GraphRefRelationalExprM AtomType
900−verifyAtomExprTypes relIn (AttributeAtomExpr attrName) expectedType = runExceptT $ do
892+verifyGraphRefAtomExprTypes relIn (AttributeAtomExpr attrName) expectedType = do
901− rstate <- lift ask
893+ env <- askEnv
902 case A.atomTypeForAttributeName attrName (attributes relIn) of
894 case A.atomTypeForAttributeName attrName (attributes relIn) of
903− Right aType -> either throwE pure (atomTypeVerify expectedType aType)
895+ Right aType -> lift $ except $ atomTypeVerify expectedType aType
904− (Left err@(NoSuchAttributeNamesError _)) -> case rstate of
896+ (Left err@(NoSuchAttributeNamesError _)) ->
905− RelationalExprStateTupleElems _ _ -> throwE err
897+ let attrs' = envAttributes env in
906− RelationalExprStateElems _ -> throwE err
898+ if attrs' == emptyAttributes then
907− RelationalExprStateAttrsElems _ attrs -> case A.attributeForName attrName attrs of
901+ case A.attributeForName attrName attrs' of
908− Left err' -> throwE err'
902+ Left err' -> throwError err'
909− Right attrType -> either throwE pure (atomTypeVerify expectedType (A.atomType attrType))
903+ Right attrType -> lift $ except $ atomTypeVerify expectedType (A.atomType attrType)
910− Left err -> throwE err
904+ Left err -> throwError err
906+verifyGraphRefAtomExprTypes _ (NakedAtomExpr atom) expectedType =
911−verifyAtomExprTypes _ (NakedAtomExpr atom) expectedType = pure (atomTypeVerify expectedType (atomTypeForAtom atom))
907+ lift $ except $ atomTypeVerify expectedType (atomTypeForAtom atom)
912−verifyAtomExprTypes relIn (FunctionAtomExpr funcName funcArgExprs _) expectedType = do
908+verifyGraphRefAtomExprTypes relIn (FunctionAtomExpr funcName funcArgExprs tid) expectedType = do
913− rstate <- ask
909+ context <- gfDatabaseContextForMarker tid
914 let functions = atomFunctions context
910 let functions = atomFunctions context
915− context = stateElemsContext rstate
917− func <- either throwE pure (atomFunctionForName funcName functions)
911+ func <- lift $ except $ atomFunctionForName funcName functions
918− let expectedArgTypes = atomFuncType func
912+ let expectedArgTypes = atomFuncType func
919− funcArgTypes <- mapM (\(atomExpr,expectedType2,argCount) -> case runReader (verifyAtomExprTypes relIn atomExpr expectedType2) rstate of
913+ funcArgVerifier (atomExpr, expectedType2, argCount) = do
914+ let handler :: RelationalError -> GraphRefRelationalExprM AtomType
920− Left (AtomTypeMismatchError expSubType actSubType) -> throwE (AtomFunctionTypeError funcName argCount expSubType actSubType)
915+ handler (AtomTypeMismatchError expSubType actSubType) = throwError (AtomFunctionTypeError funcName argCount expSubType actSubType)
921− Left err -> throwE err
916+ handler err = throwError err
922− Right x -> pure x
917+ verifyGraphRefAtomExprTypes relIn atomExpr expectedType2 `catchError` handler
923− ) $ zip3 funcArgExprs expectedArgTypes [1..]
918+ funcArgTypes <- mapM funcArgVerifier $ zip3 funcArgExprs expectedArgTypes [1..]
924− if length funcArgTypes /= length expectedArgTypes - 1 then
919+ if length funcArgTypes /= length expectedArgTypes - 1 then
925− throwE (AtomTypeCountError funcArgTypes expectedArgTypes)
920+ throwError (AtomTypeCountError funcArgTypes expectedArgTypes)
927− either throwE pure (atomTypeVerify expectedType (last expectedArgTypes))
922+ lift $ except $ atomTypeVerify expectedType (last expectedArgTypes)
928−verifyAtomExprTypes relIn (RelationAtomExpr relationExpr) expectedType = runExceptT $ do
923+verifyGraphRefAtomExprTypes relIn (RelationAtomExpr relationExpr) expectedType =
929− rstate <- lift ask
924+ do
930− relType <- either throwE pure (runReader (typeForRelationalExpr relationExpr) (mergeAttributesIntoRelationalExprState (attributes relIn) rstate))
925+ let mergedAttrsEnv e = mergeAttributesIntoGraphRefRelationalExprEnv (attributes relIn) e
926+ relType <- R.local mergedAttrsEnv (typeForGraphRefRelationalExpr relationExpr)
931− either throwE pure (atomTypeVerify expectedType (RelationAtomType (attributes relType)))
927+ lift $ except $ atomTypeVerify expectedType (RelationAtomType (attributes relType))
932−verifyAtomExprTypes rel cons@ConstructedAtomExpr{} expectedType = runExceptT $ do
928+verifyGraphRefAtomExprTypes rel cons@ConstructedAtomExpr{} expectedType = do
933− cType <- liftE (typeFromAtomExpr (attributes rel) cons)
929+ cType <- typeForGraphRefAtomExpr (attributes rel) cons
934− either throwE pure (atomTypeVerify expectedType cType)
930+ lift $ except $ atomTypeVerify expectedType cType
936-- | Look up the type's name and create a new attribute.
932-- | Look up the type's name and create a new attribute.
937−evalAttrExpr :: TypeConstructorMapping -> AttributeExpr -> Either RelationalError Attribute
933+evalGraphRefAttrExpr :: GraphRefAttributeExpr -> GraphRefRelationalExprM Attribute
938−evalAttrExpr aTypes (AttributeAndTypeNameExpr attrName tCons ()) = do
934+evalGraphRefAttrExpr (AttributeAndTypeNameExpr attrName tCons transId) = do
935+ tConsMap <- typeConstructorMapping <$> gfDatabaseContextForMarker transId
939− aType <- atomTypeForTypeConstructorValidate True tCons aTypes M.empty
936+ aType <- lift $ except $ atomTypeForTypeConstructorValidate True tCons tConsMap M.empty
940− validateAtomType aType aTypes
937+ lift $ except $ validateAtomType aType tConsMap
941− Right (Attribute attrName aType)
938+ pure $ Attribute attrName aType
943−evalAttrExpr _ (NakedAttributeExpr attr) = Right attr
940+evalGraphRefAttrExpr (NakedAttributeExpr attr) = pure attr
945−evalTupleExpr :: Maybe Attributes -> TupleExpr -> RelationalExprState (Either RelationalError RelationTuple)
942+-- for tuple type concrete resolution (Nothing ==> Maybe Int) when the attributes hint is Nothing, we need to first process all the tuples, then extract the concrete types on a per-attribute basis, then reprocess the tuples to include the concrete types
943+evalGraphRefTupleExprs :: Maybe Attributes -> GraphRefTupleExprs -> GraphRefRelationalExprM [RelationTuple]
944+evalGraphRefTupleExprs _ (TupleExprs _ []) = pure []
945+evalGraphRefTupleExprs mAttrs (TupleExprs fixedMarker tupleExprL) = do
946+ tuples <- mapM (evalGraphRefTupleExpr mAttrs) tupleExprL
947+ finalAttrs <- case mAttrs of
948+ Just attrs -> pure attrs
951+ [] -> pure emptyAttributes
952+ (headTuple:tailTuples) -> do
953+ --gather up resolved atom types or throw an error if an attribute cannot be made concrete from the inferred types- this could still fail if the type cannot be inferred (e.g. from [Nothing, Nothing])
955+ processTupleAttrs (tupAttr, accAttr) =
956+ --if the attribute is a constructedatomtype, we can recurse into it to potentially resolve type variables
957+ if isResolvedAttribute accAttr && tupAttr == accAttr then
960+ lift $ except $ resolveAttributes accAttr tupAttr
961+ mostResolvedTypes <-
962+ foldM (\acc tup -> do
963+ let zipped = zip (V.toList . attributesVec $ tupleAttributes tup) acc
964+ accNames = S.fromList $ map A.attributeName acc
965+ tupNames = A.attributeNameSet (tupleAttributes tup)
966+ attrNamesDiff = S.union (S.difference accNames tupNames) (S.difference tupNames accNames)
967+ unless (null attrNamesDiff) (throwError (AttributeNamesMismatchError attrNamesDiff))
968+ nextTupleAttrs <- mapM processTupleAttrs zipped
969+ let diff = A.attributesDifference (A.attributesFromList nextTupleAttrs) (A.attributesFromList acc)
970+ if diff == A.emptyAttributes then
973+ throwError (TupleAttributeTypeMismatchError diff)
974+ ) (V.toList . attributesVec $ tupleAttributes headTuple) tailTuples
975+ pure (A.attributesFromList mostResolvedTypes)
976+ --strategy: if all the tuple expr transaction markers refer to one location, then we can pass the type constructor mapping from that location, otherwise, we cannot assume that the types are the same
977+ tConsMap <- case singularTransactions tupleExprL of
978+ SingularTransactionRef commonTransId ->
979+ typeConstructorMapping <$> gfDatabaseContextForMarker commonTransId
980+ NoTransactionsRef ->
981+ typeConstructorMapping <$> gfDatabaseContextForMarker fixedMarker
982+ -- if there are multiple transaction markers in the TupleExprs, then we can't assume a single type constructor mapping- this could be improved in the future, but if all the tuples are fully resolved, then we don't need further resolution
983+ _ -> throwError TupleExprsReferenceMultipleMarkersError
984+ lift $ except $ validateAttributes tConsMap finalAttrs
985+ mapM (lift . except . resolveTypesInTuple finalAttrs tConsMap) tuples
988+--resolveAttributes (Attribute "gonk" (ConstructedAtomType "Either" (fromList [("a",IntegerAtomType),("b",TypeVariableType "b")]))) (Attribute "gonk" (ConstructedAtomType "Either" (fromList [("a",TypeVariableType "a"),("b",TextAtomType)])))
990+evalGraphRefTupleExpr :: Maybe Attributes -> GraphRefTupleExpr -> GraphRefRelationalExprM RelationTuple
946−evalTupleExpr mAttrs (TupleExpr tupMap) = do
991+evalGraphRefTupleExpr mAttrs (TupleExpr tupMap) = do
947− context <- fmap stateElemsContext ask
949 -- it's not possible for AtomExprs in tuple constructors to reference other Attributes' atoms due to the necessary order-of-operations (need a tuple to pass to evalAtomExpr)- it may be possible with some refactoring of type usage or delayed evaluation- needs more thought, but not a priority
992 -- it's not possible for AtomExprs in tuple constructors to reference other Attributes' atoms due to the necessary order-of-operations (need a tuple to pass to evalAtomExpr)- it may be possible with some refactoring of type usage or delayed evaluation- needs more thought, but not a priority
950 -- I could adjust this logic so that when the attributes are not specified (Nothing), then I can attempt to extract the attributes from the tuple- the type resolution will blow up if an ambiguous data constructor is used (Left 4) and this should allow simple cases to "relation{tuple{a 4}}" to be processed
993 -- I could adjust this logic so that when the attributes are not specified (Nothing), then I can attempt to extract the attributes from the tuple- the type resolution will blow up if an ambiguous data constructor is used (Left 4) and this should allow simple cases to "relation{tuple{a 4}}" to be processed
951− let attrs = fromMaybe A.emptyAttributes mAttrs
994+ let attrs = fromMaybe A.emptyAttributes mAttrs
952− attrAtoms <- mapM (\(attrName, aExpr) -> do
995+ resolveOneAtom (attrName, aExpr) =
953− --provided when the relation header is available
997+ --provided when the relation header is available
954− let eExpectedAtomType = A.atomTypeForAttributeName attrName attrs
998+ let eExpectedAtomType = A.atomTypeForAttributeName attrName attrs
955− unresolvedType <- liftE (typeFromAtomExpr attrs aExpr)
999+ unresolvedType <- typeForGraphRefAtomExpr attrs aExpr
956− resolvedType <- case eExpectedAtomType of
1000+ resolvedType <- case eExpectedAtomType of
957 Left _ -> pure unresolvedType
1001 Left _ -> pure unresolvedType
958− Right typeHint -> either throwE pure (resolveAtomType typeHint unresolvedType)
1002+ Right typeHint -> lift $ except $ resolveAtomType typeHint unresolvedType
959 --resolve atom typevars based on resolvedType?
1003 --resolve atom typevars based on resolvedType?
960− newAtom <- liftE (evalAtomExpr emptyTuple aExpr)
1004+ newAtom <- evalGraphRefAtomExpr emptyTuple aExpr
961− pure (attrName, newAtom, resolvedType)
1005+ pure (attrName, newAtom, resolvedType)
962− ) (M.toList tupMap)
1006+ attrAtoms <- mapM resolveOneAtom (M.toList tupMap)
963− let tupAttrs = A.attributesFromList $ map (\(attrName, _, aType) -> Attribute attrName aType) attrAtoms
1007+ let tupAttrs = A.attributesFromList $ map (\(attrName, _, aType) -> Attribute attrName aType) attrAtoms
964− atoms = V.fromList $ map (\(_, atom, _) -> atom) attrAtoms
1008+ atoms = V.fromList $ map (\(_, atom, _) -> atom) attrAtoms
965− tup = mkRelationTuple tupAttrs atoms
1009+ tup = mkRelationTuple tupAttrs atoms
966− tConss = typeConstructorMapping context
967− finalAttrs = fromMaybe tupAttrs mAttrs
1010+ finalAttrs = fromMaybe tupAttrs mAttrs
968 --verify that the attributes match
1011 --verify that the attributes match
969− when (A.attributeNameSet finalAttrs /= A.attributeNameSet tupAttrs) $ throwE (TupleAttributeTypeMismatchError tupAttrs)
1012+ when (A.attributeNameSet finalAttrs /= A.attributeNameSet tupAttrs) $ throwError (TupleAttributeTypeMismatchError tupAttrs)
1013+ --we can't resolve types here- they have to be resolved at the atom level where the graph ref is held
970− tup' <- either throwE pure (resolveTypesInTuple finalAttrs tConss (reorderTuple finalAttrs tup))
1014+ --tup' <- lift $ except (resolveTypesInTuple finalAttrs tConss (reorderTuple finalAttrs tup))
1015+ let tup' = reorderTuple finalAttrs tup
1016+ --TODO: restore type resolution
971− _ <- either throwE pure (validateTuple tup' tConss)
1017+-- _ <- lift $ except (validateTuple tup' tConss)
972− pure tup'
1018+ pure tup'
974−evalAttributeNames :: AttributeNames -> RelationalExpr -> RelationalExprState (Either RelationalError (S.Set AttributeName))
1020+--temporary implementation until we have a proper planner+executor
975−evalAttributeNames attrNames expr = do
1021+evalGraphRefRelationalExpr :: GraphRefRelationalExpr -> GraphRefRelationalExprM Relation
976− eExprType <- typeForRelationalExpr expr
1022+evalGraphRefRelationalExpr (MakeRelationFromExprs mAttrExprs tupleExprs) = do
977− case eExprType of
1023+ mAttrs <- case mAttrExprs of
978− Left err -> pure (Left err)
1024+ Just _ ->
979− Right exprTyp -> do
1025+ Just . A.attributesFromList <$> mapM evalGraphRefAttrExpr (fromMaybe [] mAttrExprs)
980− let typeNameSet = S.fromList (V.toList (A.attributeNames (attributes exprTyp)))
1026+ Nothing -> pure Nothing
981− case attrNames of
1027+ tuples <- evalGraphRefTupleExprs mAttrs tupleExprs
982− AttributeNames names ->
1028+ let attrs = fromMaybe firstTupleAttrs mAttrs
983− case A.projectionAttributesForNames names (attributes exprTyp) of
1029+ firstTupleAttrs = if null tuples then A.emptyAttributes else tupleAttributes (head tuples)
984− Left err -> pure (Left err)
1030+ lift $ except $ mkRelation attrs (RelationTupleSet tuples)
985− Right attrs -> pure (Right (S.fromList (V.toList (A.attributeNames attrs))))
1031+evalGraphRefRelationalExpr (MakeStaticRelation attributeSet tupleSet) =
986−
1032+ lift $ except $ mkRelation attributeSet tupleSet
987− InvertedAttributeNames names -> do
1033+evalGraphRefRelationalExpr (ExistingRelation rel) = pure rel
988− let nonExistentAttributeNames = A.attributeNamesNotContained names typeNameSet
989− if not (S.null nonExistentAttributeNames) then
990− pure (Left (AttributeNamesMismatchError nonExistentAttributeNames))
992− pure (Right (A.nonMatchingAttributeNameSet names typeNameSet))
994− UnionAttributeNames namesA namesB -> do
995− eNameSetA <- evalAttributeNames namesA expr
997− Left err -> pure (Left err)
998− Right nameSetA -> do
999− eNameSetB <- evalAttributeNames namesB expr
1001− Left err -> pure (Left err)
1003− pure (Right (S.union nameSetA nameSetB))
1005− IntersectAttributeNames namesA namesB -> do
1006− eNameSetA <- evalAttributeNames namesA expr
1008− Left err -> pure (Left err)
1009− Right nameSetA -> do
1010− eNameSetB <- evalAttributeNames namesB expr
1012− Left err -> pure (Left err)
1014− pure (Right (S.intersection nameSetA nameSetB))
1016− RelationalExprAttributeNames attrExpr -> do
1017− eAttrExprType <- typeForRelationalExpr attrExpr
1018− case eAttrExprType of
1019− Left err -> pure (Left err)
1020− Right attrExprType -> pure (Right (A.attributeNameSet (attributes attrExprType)))
1022−evalGraphRefRelationalExpr :: GraphRefRelationalExpr -> TransactionGraph -> Either RelationalError Relation
1023−evalGraphRefRelationalExpr (RelationVariable name tid) graph = do
1034+evalGraphRefRelationalExpr (RelationVariable name tid) = do
1024− ctx <- dbContextForTransId tid graph
1035+ ctx <- gfDatabaseContextForMarker tid
1025 case M.lookup name (relationVariables ctx) of
1036 case M.lookup name (relationVariables ctx) of
1026− Nothing -> Left (RelVarNotDefinedError name)
1037+ Nothing -> throwError (RelVarNotDefinedError name)
1027− Just rv -> evalGraphRefRelationalExpr rv graph
1038+ Just rv -> evalGraphRefRelationalExpr rv
1039+evalGraphRefRelationalExpr (Project attrNames expr) = do
1040+ attrNameSet <- evalGraphRefAttributeNames attrNames expr
1041+ rel <- evalGraphRefRelationalExpr expr
1042+ lift $ except $ project attrNameSet rel
1043+evalGraphRefRelationalExpr (Union exprA exprB) = do
1044+ relA <- evalGraphRefRelationalExpr exprA
1045+ relB <- evalGraphRefRelationalExpr exprB
1046+ lift $ except $ union relA relB
1047+evalGraphRefRelationalExpr (Join exprA exprB) = do
1048+ relA <- evalGraphRefRelationalExpr exprA
1049+ relB <- evalGraphRefRelationalExpr exprB
1050+ lift $ except $ join relA relB
1051+evalGraphRefRelationalExpr (Rename oldName newName expr) = do
1052+ rel <- evalGraphRefRelationalExpr expr
1053+ lift $ except $ rename oldName newName rel
1054+evalGraphRefRelationalExpr (Difference exprA exprB) = do
1055+ relA <- evalGraphRefRelationalExpr exprA
1056+ relB <- evalGraphRefRelationalExpr exprB
1057+ lift $ except $ difference relA relB
1058+evalGraphRefRelationalExpr (Group groupAttrNames newAttrName expr) = do
1059+ groupNames <- evalGraphRefAttributeNames groupAttrNames expr
1060+ rel <- evalGraphRefRelationalExpr expr
1061+ lift $ except $ group groupNames newAttrName rel
1062+evalGraphRefRelationalExpr (Ungroup groupAttrName expr) = do
1063+ rel <- evalGraphRefRelationalExpr expr
1064+ lift $ except $ ungroup groupAttrName rel
1065+evalGraphRefRelationalExpr (Restrict predExpr expr) = do
1066+ rel <- evalGraphRefRelationalExpr expr
1067+ filt <- predicateRestrictionFilter (attributes rel) predExpr
1068+ lift $ except $ restrict filt rel
1069+evalGraphRefRelationalExpr (Equals exprA exprB) = do
1070+ relA <- evalGraphRefRelationalExpr exprA
1071+ relB <- evalGraphRefRelationalExpr exprB
1072+ pure $ if relA == relB then relationTrue else relationFalse
1073+evalGraphRefRelationalExpr (NotEquals exprA exprB) = do
1074+ relA <- evalGraphRefRelationalExpr exprA
1075+ relB <- evalGraphRefRelationalExpr exprB
1076+ pure $ if relA == relB then relationFalse else relationTrue
1077+evalGraphRefRelationalExpr (Extend extendTupleExpr expr) = do
1078+ rel <- evalGraphRefRelationalExpr expr
1079+ (newAttrs, tupProc) <- extendGraphRefTupleExpressionProcessor rel extendTupleExpr
1080+ lift $ except $ relMogrify tupProc newAttrs rel
1081+evalGraphRefRelationalExpr expr@With{} =
1082+ --strategy A: add relation variables to the contexts in the graph
1083+ --strategy B: drop in macros in place (easier programmatically)
1084+ --strategy B implementation
1085+ evalGraphRefRelationalExpr (substituteWithNameMacros [] expr)
1029dbContextForTransId :: TransactionId -> TransactionGraph -> Either RelationalError DatabaseContext
1087dbContextForTransId :: TransactionId -> TransactionGraph -> Either RelationalError DatabaseContext
1030dbContextForTransId tid graph = do
1088dbContextForTransId tid graph = do
1031 trans <- transactionForId tid graph
1089 trans <- transactionForId tid graph
1032− pure (concreteDatabaseContext ctx)
1090+ pure (concreteDatabaseContext trans)
1034transactionForId :: TransactionId -> TransactionGraph -> Either RelationalError Transaction
1092transactionForId :: TransactionId -> TransactionGraph -> Either RelationalError Transaction
1035transactionForId tid graph
1093transactionForId tid graph
@@ -1042,113 +1100,293 @@ transactionForId tid graph
1043 matchingTrans = S.filter (\(Transaction idMatch _ _) -> idMatch == tid) (transactionsForGraph graph)
1101 matchingTrans = S.filter (\(Transaction idMatch _ _) -> idMatch == tid) (transactionsForGraph graph)
1045−processRestrictionPredicateExpr :: RestrictionPredicateExpr -> RelationalExprState (Either RelationalError GraphRefRestrictionPredicateExpr)
1046−processRestrictionPredicateExpr TruePredicate = TruePredicate
1047−processRestrictionPredicateExpr (AndPredicate a b) = pure $ AndPredicate <$> processRestrictionPredicateExpr a <*> processRestrictionPredicateExpr b
1048−processRestrictionPredicateExpr (OrPredicate a b) = OrPredicate <$> processRestrictionPredicateExpr a <*> processRestrictionPredicateExpr b
1049−processRestrictionPredicateExpr (NotPredicate a) = pure $ NotPredicate <$> processRestrictionPredicateExpr a
1050−processRestrictionPredicateExpr (RelationalExprPredicate expr) = pure $ RelationalExprPredicate <$> evalRelationalExpr expr
1051−processRestrictionPredicateExpr (AtomExprPredicate expr) = AtomExprPredicate <$> evalAtomExpr expr
1052−processRestrictionPredicateExpr (AttributeEqualityPredicate nam expr) = AttributeEqualityPredicate nam <$> evalAtomExpr expr
1054−processExtendTupleExpr :: ExtendTupleExpr -> RelationalExprState (Either RelationalError (ExtendTupleExprBase a))
1055−processExtendTupleExpr (AttributeExtendTupleExpr nam atomExpr) = do
1056− eExpr <- evalAtomExpr atomExpr
1058− Left err -> pure (Left err)
1059− Right expr -> pure (Right (AttributeExtendTupleExpr nam expr))
1061−typeForGraphRefRelationalExpr :: GraphRefRelationalExpr -> TransactionGraph -> Either RelationalError Relation
1103+typeForGraphRefRelationalExpr :: GraphRefRelationalExpr -> GraphRefRelationalExprM Relation
1062−typeForGraphRefRelationalExpr (MakeStaticRelation attrs _) _ = mkRelation attrs emptyTupleSet
1104+typeForGraphRefRelationalExpr (MakeStaticRelation attrs _) = lift $ except $ mkRelation attrs emptyTupleSet
1063−typeForGraphRefRelationalExpr (ExistingRelation rel) _ = pure (emptyRelationWithAttrs (attributes rel))
1105+typeForGraphRefRelationalExpr (ExistingRelation rel) = pure (emptyRelationWithAttrs (attributes rel))
1064−typeForGraphRefRelationalExpr (MakeRelationFromExprs mAttrExprs tupleExprs) graph =
1106+typeForGraphRefRelationalExpr (MakeRelationFromExprs mAttrExprs tupleExprs) = do
1065− case mAttrExprs of
1107+ mAttrs <- case mAttrExprs of
1066− Just attrExprs -> do
1108+ Just attrExprs -> do
1067− attrs <- mapM (\e -> evalGraphRefAttributeExpr e graph) attrExprs
1109+ attrs <- mapM evalGraphRefAttributeExpr attrExprs
1110+ pure (Just (attributesFromList attrs))
1111+ Nothing -> pure Nothing
1112+ tuples <- evalGraphRefTupleExprs mAttrs tupleExprs
1113+ let retAttrs = case tuples of
1114+ (tup:_) -> tupleAttributes tup
1115+ [] -> fromMaybe A.emptyAttributes mAttrs
1068− pure (emptyRelationWithAttrs attrs)
1116+ pure $ emptyRelationWithAttrs retAttrs
1069−typeForGraphRefRelationalExpr (RelationVariable rvName tid) graph = do
1118+typeForGraphRefRelationalExpr (RelationVariable rvName tid) = do
1070− trans <- transactionForId tid graph
1071− let relVars = relationVariables (concreteDatabaseContext trans)
1119+ relVars <- relationVariables <$> gfDatabaseContextForMarker tid
1072 case M.lookup rvName relVars of
1120 case M.lookup rvName relVars of
1073− Nothing -> Left $ RelVarNotDefinedError name
1121+ Nothing -> throwError (RelVarNotDefinedError rvName)
1074− Just rvExpr -> typeForGraphRefRelationalExpr rvExpr graph
1123+ typeForGraphRefRelationalExpr rvExpr
1075−typeForGraphRefRelationalExpr (Project attrNames expr) graph = do
1124+typeForGraphRefRelationalExpr (Project attrNames expr) = do
1076− exprType <- typeForGraphRefRelationalExpr expr graph
1125+ exprType' <- typeForGraphRefRelationalExpr expr
1077− projectionAttrs <- evalGraphRefAttributeNames attrNames expr graph
1126+ projectionAttrs <- evalGraphRefAttributeNames attrNames expr
1078− project projectionAttrs exprType
1127+ lift $ except $ project projectionAttrs exprType'
1079−
1128+typeForGraphRefRelationalExpr (Union exprA exprB) = do
1129+ exprA' <- typeForGraphRefRelationalExpr exprA
1130+ exprB' <- typeForGraphRefRelationalExpr exprB
1131+ lift $ except $ union exprA' exprB'
1132+typeForGraphRefRelationalExpr (Join exprA exprB) = do
1133+ exprA' <- typeForGraphRefRelationalExpr exprA
1134+ exprB' <- typeForGraphRefRelationalExpr exprB
1135+ lift $ except $ join exprA' exprB'
1136+typeForGraphRefRelationalExpr (Rename oldAttr newAttr expr) = do
1137+ expr' <- typeForGraphRefRelationalExpr expr
1138+ lift $ except $ rename oldAttr newAttr expr'
1139+typeForGraphRefRelationalExpr (Difference exprA exprB) = do
1140+ exprA' <- typeForGraphRefRelationalExpr exprA
1141+ exprB' <- typeForGraphRefRelationalExpr exprB
1142+ lift $ except $ difference exprA' exprB'
1143+typeForGraphRefRelationalExpr (Group groupNames attrName expr) = do
1144+ expr' <- typeForGraphRefRelationalExpr expr
1145+ groupNames' <- evalGraphRefAttributeNames groupNames expr
1146+ lift $ except $ group groupNames' attrName expr'
1147+typeForGraphRefRelationalExpr (Ungroup groupAttrName expr) = do
1148+ expr' <- typeForGraphRefRelationalExpr expr
1149+ lift $ except $ ungroup groupAttrName expr'
1150+typeForGraphRefRelationalExpr (Restrict pred' expr) = do
1151+ expr' <- typeForGraphRefRelationalExpr expr
1152+ filt <- predicateRestrictionFilter (attributes expr') pred'
1153+ lift $ except $ restrict filt expr'
1154+typeForGraphRefRelationalExpr Equals{} =
1156+typeForGraphRefRelationalExpr NotEquals{} =
1158+typeForGraphRefRelationalExpr (Extend extendTupleExpr expr) = do
1159+ rel <- typeForGraphRefRelationalExpr expr
1160+ evalGraphRefRelationalExpr (Extend extendTupleExpr (ExistingRelation rel))
1161+typeForGraphRefRelationalExpr expr@(With withs _) = do
1162+ let expr' = substituteWithNameMacros [] expr
1163+ checkMacroName (WithNameExpr macroName tid) = do
1164+ rvs <- relationVariables <$> gfDatabaseContextForMarker tid
1165+ case M.lookup macroName rvs of
1166+ Just _ -> lift $ except $ Left (RelVarAlreadyDefinedError macroName) --this error does not include the transaction marker, but should be good enough to identify the cause
1168+ mapM_ (checkMacroName . fst) withs
1169+ typeForGraphRefRelationalExpr expr'
1080−evalGraphRefAttributeNames :: AttributeNames -> GraphRefRelationalExpr -> TransactionGraph -> Either RelationalError (S.Set AttributeName)
1171+evalGraphRefAttributeNames :: GraphRefAttributeNames -> GraphRefRelationalExpr -> GraphRefRelationalExprM (S.Set AttributeName)
1081−evalGraphRefAttributeNames attrNames expr graph = do
1172+evalGraphRefAttributeNames attrNames expr = do
1082− exprTyp <- typeForGraphRefRelationalExpr expr graph
1173+ exprType' <- typeForGraphRefRelationalExpr expr
1083− let typeNameSet = S.fromList (V.toList (A.attributeNames (attributes exprTyp)))
1174+ let typeNameSet = S.fromList (V.toList (A.attributeNames (attributes exprType')))
1084 case attrNames of
1175 case attrNames of
1085− AttributeNames names ->
1176+ AttributeNames names ->
1086− case A.projectionAttributesForNames names (attributes exprTyp) of
1177+ case A.projectionAttributesForNames names (attributes exprType') of
1087− Left err -> pure (Left err)
1178+ Left err -> throwError err
1088− Right attrs -> pure (Right (S.fromList (V.toList (A.attributeNames attrs))))
1179+ Right attrs -> pure (S.fromList (V.toList (A.attributeNames attrs)))
1090− InvertedAttributeNames names -> do
1181+ InvertedAttributeNames names -> do
1091 let nonExistentAttributeNames = A.attributeNamesNotContained names typeNameSet
1182 let nonExistentAttributeNames = A.attributeNamesNotContained names typeNameSet
1092 if not (S.null nonExistentAttributeNames) then
1183 if not (S.null nonExistentAttributeNames) then
1093− pure (Left (AttributeNamesMismatchError nonExistentAttributeNames))
1184+ throwError $ AttributeNamesMismatchError nonExistentAttributeNames
1095− pure (Right (A.nonMatchingAttributeNameSet names typeNameSet))
1186+ pure (A.nonMatchingAttributeNameSet names typeNameSet)
1097− UnionAttributeNames namesA namesB -> do
1188+ UnionAttributeNames namesA namesB -> do
1098− eNameSetA <- evalAttributeNames namesA expr
1189+ nameSetA <- evalGraphRefAttributeNames namesA expr
1099− case eNameSetA of
1190+ nameSetB <- evalGraphRefAttributeNames namesB expr
1100− Left err -> pure (Left err)
1101− Right nameSetA -> do
1102− eNameSetB <- evalAttributeNames namesB expr
1104− Left err -> pure (Left err)
1106− pure (Right (S.union nameSetA nameSetB))
1191+ pure (S.union nameSetA nameSetB)
1108− IntersectAttributeNames namesA namesB -> do
1193+ IntersectAttributeNames namesA namesB -> do
1109− eNameSetA <- evalAttributeNames namesA expr
1194+ nameSetA <- evalGraphRefAttributeNames namesA expr
1110− case eNameSetA of
1195+ nameSetB <- evalGraphRefAttributeNames namesB expr
1111− Left err -> pure (Left err)
1112− Right nameSetA -> do
1113− eNameSetB <- evalAttributeNames namesB expr
1115− Left err -> pure (Left err)
1117− pure (Right (S.intersection nameSetA nameSetB))
1196+ pure (S.intersection nameSetA nameSetB)
1119− RelationalExprAttributeNames attrExpr -> do
1198+ RelationalExprAttributeNames attrExpr -> do
1120− eAttrExprType <- typeForRelationalExpr attrExpr
1199+ attrExprType <- typeForGraphRefRelationalExpr attrExpr
1121− case eAttrExprType of
1122− Left err -> pure (Left err)
1123− Right attrExprType -> pure (Right (A.attributeNameSet (attributes attrExprType)))
1200+ pure (A.attributeNameSet (attributes attrExprType))
1125−
1202+evalGraphRefAttributeExpr :: GraphRefAttributeExpr -> GraphRefRelationalExprM Attribute
1203+evalGraphRefAttributeExpr (AttributeAndTypeNameExpr attrName tCons tid) = do
1204+ tConsMap <- typeConstructorMapping <$> gfDatabaseContextForMarker tid
1205+ case atomTypeForTypeConstructorValidate True tCons tConsMap M.empty of
1206+ Left err -> throwError err
1208+ case validateAtomType aType tConsMap of
1209+ Left err -> throwError err
1210+ Right _ -> pure (Attribute attrName aType)
1211+evalGraphRefAttributeExpr (NakedAttributeExpr attr) = pure attr
1213+mkEmptyRelVars :: RelationVariables -> RelationVariables
1214+mkEmptyRelVars = M.map mkEmptyRelVar
1216+ mkEmptyRelVar expr@MakeRelationFromExprs{} = expr --do not truncate here because we might lose essential type information in emptying the tuples
1217+ mkEmptyRelVar (MakeStaticRelation attrs _) = MakeStaticRelation attrs emptyTupleSet
1218+ mkEmptyRelVar (ExistingRelation rel) = ExistingRelation (emptyRelationWithAttrs (attributes rel))
1219+ mkEmptyRelVar rv@RelationVariable{} = Restrict (NotPredicate TruePredicate) rv
1220+ mkEmptyRelVar (Project attrNames expr) = Project attrNames (mkEmptyRelVar expr)
1221+ mkEmptyRelVar (Union exprA exprB) = Union (mkEmptyRelVar exprA) (mkEmptyRelVar exprB)
1222+ mkEmptyRelVar (Join exprA exprB) = Join (mkEmptyRelVar exprA) (mkEmptyRelVar exprB)
1223+ mkEmptyRelVar (Rename nameA nameB expr) = Rename nameA nameB (mkEmptyRelVar expr)
1224+ mkEmptyRelVar (Difference exprA exprB) = Difference (mkEmptyRelVar exprA) (mkEmptyRelVar exprB)
1225+ mkEmptyRelVar (Group attrNames attrName expr) = Group attrNames attrName (mkEmptyRelVar expr)
1226+ mkEmptyRelVar (Ungroup attrName expr) = Ungroup attrName (mkEmptyRelVar expr)
1227+ mkEmptyRelVar (Restrict pred' expr) = Restrict pred' (mkEmptyRelVar expr)
1228+ mkEmptyRelVar (Equals exprA exprB) = Equals (mkEmptyRelVar exprA) (mkEmptyRelVar exprB)
1229+ mkEmptyRelVar (NotEquals exprA exprB) = NotEquals (mkEmptyRelVar exprA) (mkEmptyRelVar exprB)
1230+ mkEmptyRelVar (Extend extTuple expr) = Extend extTuple (mkEmptyRelVar expr)
1231+ mkEmptyRelVar (With macros expr) = With (map (second mkEmptyRelVar) macros) (mkEmptyRelVar expr)
1234+dbErr :: RelationalError -> DatabaseContextEvalMonad ()
1235+dbErr err = lift (except (Left err))
1237+-- | Return a Relation describing the relation variables.
1238+relationVariablesAsRelation :: DatabaseContext -> TransactionGraph -> Either RelationalError Relation
1239+relationVariablesAsRelation ctx graph = do
1240+ let subrelAttrs = A.attributesFromList [Attribute "attribute" TextAtomType, Attribute "type" TextAtomType]
1241+ attrs = A.attributesFromList [Attribute "name" TextAtomType,
1242+ Attribute "attributes" (RelationAtomType subrelAttrs)]
1243+ relVars = relationVariables ctx
1244+ mkRvDesc (rvName, gfExpr) = do
1245+ let gfEnv = freshGraphRefRelationalExprEnv (Just ctx) graph
1246+ gfType <- runGraphRefRelationalExprM gfEnv (typeForGraphRefRelationalExpr gfExpr)
1247+ pure (rvName, gfType)
1248+ relVarToAtomList (rvName, rel) = [TextAtom rvName, attributesToRel (attributesVec (attributes rel))]
1249+ attrAtoms a = [TextAtom (A.attributeName a), TextAtom (prettyAtomType (A.atomType a))]
1250+ attributesToRel attrl = case mkRelationFromList subrelAttrs (map attrAtoms (V.toList attrl)) of
1251+ Left err -> error ("relationVariablesAsRelation pooped " ++ show err)
1252+ Right rel -> RelationAtom rel
1253+ rvs <- mapM mkRvDesc (M.toList relVars)
1254+ let tups = map relVarToAtomList rvs
1255+ mkRelationFromList attrs tups
1257+-- | An unoptimized variant of evalGraphRefRelationalExpr for testing.
1258+evalRelationalExpr :: RelationalExpr -> RelationalExprM Relation
1259+evalRelationalExpr expr = do
1261+ context <- reContext
1262+ let expr' = runProcessExprM UncommittedContextMarker (processRelationalExpr expr)
1263+ gfEnv = freshGraphRefRelationalExprEnv (Just context) graph
1264+ case runGraphRefRelationalExprM gfEnv (evalGraphRefRelationalExpr expr') of
1265+ Left err -> throwError err
1266+ Right rel -> pure rel
1268+class (MonadError RelationalError m, Monad m) => DatabaseContextM m where
1269+ getContext :: m DatabaseContext
1271+instance DatabaseContextM (ReaderT GraphRefRelationalExprEnv (ExceptT RelationalError Identity)) where
1272+ getContext = gfDatabaseContextForMarker UncommittedContextMarker
1128−processAtomExpr :: AtomExpr -> TransactionId -> GraphRefAtomExpr
1274+instance DatabaseContextM (RWST DatabaseContextEvalEnv () DatabaseContextEvalState (ExceptT RelationalError Identity)) where
1129−processAtomExpr (AttributeAtomExpr nam) _ = AttributeAtomExpr nam
1275+ getContext = getStateContext
1130−processAtomExpr (NakedAtomExpr atom) _ = NakedAtomExpr atom
1276+
1131−processAtomExpr (FunctionAtomExpr fName atomExprs ()) tid = FunctionAtomExpr fName (fmap processAtomExpr tid) tid
1277+relVarByName :: DatabaseContextM m => RelVarName -> m GraphRefRelationalExpr
1278+relVarByName rvName = do
1279+ relvars <- relationVariables <$> getContext
1280+ case M.lookup rvName relvars of
1281+ Nothing -> throwError (RelVarNotDefinedError rvName)
1282+ Just gfexpr -> pure gfexpr
1284+-- | resolve UncommittedTransactionMarker whenever possible- this is important in the DatabaseContext in order to mitigate self-referencing loops for updates
1285+class ResolveGraphRefTransactionMarker a where
1286+ resolve :: a -> DatabaseContextEvalMonad a
1289+instance ResolveGraphRefTransactionMarker GraphRefRelationalExpr where
1290+ resolve (MakeRelationFromExprs mAttrs tupleExprs) =
1291+ MakeRelationFromExprs mAttrs <$> resolve tupleExprs
1292+ resolve orig@MakeStaticRelation{} = pure orig
1293+ resolve orig@ExistingRelation{} = pure orig
1294+ resolve orig@(RelationVariable rvName UncommittedContextMarker) = do
1295+ rvMap <- relationVariables <$> getStateContext
1296+ case M.lookup rvName rvMap of
1297+ Nothing -> pure orig
1298+ Just resolvedRv -> resolve resolvedRv
1299+ resolve orig@RelationVariable{} = pure orig
1300+ resolve (Project attrNames relExpr) = Project <$> resolve attrNames <*> resolve relExpr
1301+ resolve (Union exprA exprB) = Union <$> resolve exprA <*> resolve exprB
1302+ resolve (Join exprA exprB) = Join <$> resolve exprA <*> resolve exprB
1303+ resolve (Rename attrA attrB expr) = Rename attrA attrB <$> resolve expr
1304+ resolve (Difference exprA exprB) = Difference <$> resolve exprA <*> resolve exprB
1305+ resolve (Group namesA nameB expr) = Group <$> resolve namesA <*> pure nameB <*> resolve expr
1306+ resolve (Ungroup nameA expr) = Ungroup nameA <$> resolve expr
1307+ resolve (Restrict restrictExpr relExpr) = Restrict <$> resolve restrictExpr <*> resolve relExpr
1308+ resolve (Equals exprA exprB) = Equals <$> resolve exprA <*> resolve exprB
1309+ resolve (NotEquals exprA exprB) = NotEquals <$> resolve exprA <*> resolve exprB
1310+ resolve (Extend extendExpr relExpr) = Extend <$> resolve extendExpr <*> resolve relExpr
1311+ resolve (With withExprs relExpr) = With <$> mapM (\(nam, expr) -> (,) <$> resolve nam <*> resolve expr) withExprs <*> resolve relExpr
1313+instance ResolveGraphRefTransactionMarker GraphRefTupleExprs where
1314+ resolve (TupleExprs marker tupleExprs) =
1315+ TupleExprs marker <$> mapM resolve tupleExprs
1317+instance ResolveGraphRefTransactionMarker GraphRefTupleExpr where
1318+ resolve (TupleExpr tupMap) = do
1319+ tupMap' <- mapM (\(attrName, expr) -> (,) attrName <$> resolve expr ) (M.toList tupMap)
1320+ pure (TupleExpr (M.fromList tupMap'))
1322+instance ResolveGraphRefTransactionMarker GraphRefAttributeNames where
1323+ resolve orig@AttributeNames{} = pure orig
1324+ resolve orig@InvertedAttributeNames{} = pure orig
1325+ resolve (UnionAttributeNames namesA namesB) = UnionAttributeNames <$> resolve namesA <*> resolve namesB
1326+ resolve (IntersectAttributeNames namesA namesB) = IntersectAttributeNames <$> resolve namesA <*> resolve namesB
1327+ resolve (RelationalExprAttributeNames expr) = RelationalExprAttributeNames <$> resolve expr
1329+instance ResolveGraphRefTransactionMarker GraphRefRestrictionPredicateExpr where
1330+ resolve TruePredicate = pure TruePredicate
1331+ resolve (AndPredicate exprA exprB) = AndPredicate <$> resolve exprA <*> resolve exprB
1332+ resolve (OrPredicate exprA exprB) = OrPredicate <$> resolve exprA <*> resolve exprB
1333+ resolve (NotPredicate expr) = NotPredicate <$> resolve expr
1334+ resolve (RelationalExprPredicate expr) = RelationalExprPredicate <$> resolve expr
1335+ resolve (AtomExprPredicate expr) = AtomExprPredicate <$> resolve expr
1336+ resolve (AttributeEqualityPredicate nam expr)= AttributeEqualityPredicate nam <$> resolve expr
1338+instance ResolveGraphRefTransactionMarker GraphRefExtendTupleExpr where
1339+ resolve (AttributeExtendTupleExpr nam atomExpr) = AttributeExtendTupleExpr nam <$> resolve atomExpr
1341+instance ResolveGraphRefTransactionMarker GraphRefWithNameExpr where
1342+ resolve orig@WithNameExpr{} = pure orig -- match uncommitted marker?
1344+instance ResolveGraphRefTransactionMarker GraphRefAtomExpr where
1345+ resolve orig@AttributeAtomExpr{} = pure orig
1346+ resolve orig@NakedAtomExpr{} = pure orig
1347+ resolve (FunctionAtomExpr nam atomExprs marker) =
1348+ FunctionAtomExpr nam <$> mapM resolve atomExprs <*> pure marker
1132−processAtomExpr (RelationAtomExpr expr) tid = RelationAtomExpr (processRelationalExpr expr tid)
1349+ resolve (RelationAtomExpr expr) = RelationAtomExpr <$> resolve expr
1133−processAtomExpr (ConstructedAtomExpr dConsName atomExprs) = ConstructedAtomExpr dConsName (fmap processAtomExpr tid) tid
1350+ resolve (ConstructedAtomExpr dConsName atomExprs marker) =
1134−
1351+ ConstructedAtomExpr dConsName <$> mapM resolve atomExprs <*> pure marker
1135−processTupleExpr :: TupleExpr -> TransactionId -> GraphRefTupleExpr
1352+
1136−processTupleExpr (TupleExpr tMap) tid = TupleExpr (M.map (processAtomExpr tid) tMap)
1353+--convert series of simple Union queries into MakeStaticRelation
1354+-- this is especially useful for long, nested applications of Union with simple tuples
1355+-- Union (MakeRelation x y) (MakeRelation x y') -> MakeRelation x (y + y')
1357+--MakeRelationFromExprs Nothing (TupleExprs UncommittedContextMarker [TupleExpr (fromList [("name", NakedAtomExpr (TextAtom "steve"))])])
1359+applyUnionCollapse :: GraphRefRelationalExpr -> GraphRefRelationalExpr
1360+applyUnionCollapse = Fold.cata opt
1362+ opt :: RelationalExprBaseF GraphRefTransactionMarker GraphRefRelationalExpr -> GraphRefRelationalExpr
1363+ opt (UnionF exprA exprB) | exprA == exprB = exprA
1365+ exprA@(MakeRelationFromExprs mAttrs1 tupExprs1)
1366+ exprB@(MakeRelationFromExprs mAttrs2 tupExprs2)) | tupExprs1 == tupExprs2 = MakeRelationFromExprs (mAttrs1 <|> mAttrs2) tupExprs1
1367+ | tupExprsNull tupExprs1 = exprB
1368+ | tupExprsNull tupExprs2 = exprA
1369+ opt x = Fold.embed x
1370+ tupExprsNull (TupleExprs _ []) = True
1371+ tupExprsNull _ = False
1374+--UPDATE optimization- find matching where clause in "lower" levels of renaming
1375+--update x where y=1 set (x:=5,z:=10); update x where y=1 set(x:=6,z:=11)
1377+-- update x where y=1 set (x:=6,z:=11)
1378+-- future opt: match individual attributes update x where y=1 set (x:=5); update x where y=1 set (z:=11) => update x where y=1 set (x:=5,z:=11)
1380+--strategy: try to collapse the top-level update (union (restrict pred MakeRelationFromExpr) expr) if it contains the same predicate and resultant relation
1382+--DELETE optimization
1383+-- if a restriction matches a previous restriction, combine them
1384+-- O(1) since it only scans at the top level, critical in benchmarks generating redundant deletions
1385+applyRestrictionCollapse :: GraphRefRelationalExpr -> GraphRefRelationalExpr
1386+applyRestrictionCollapse orig@(Restrict npred@(NotPredicate _) expr) =
1388+ orig'@(Restrict npred'@(NotPredicate _) _) | npred == npred' -> orig'
1390+applyRestrictionCollapse expr = expr
1138−evalGraphRefAttributeExpr :: GraphRefAttributeExpr -> TransactionGraph -> Either RelationalError Attribute
1392+
1139−evalGraphRefAttributeExpr (AttributeAndTypeNameExpr attrName tCons tid) graph = do
1140− trans <- transactionForId tid graph
1141− let tConsMap = typeConstructorMapping (concreteDatabaseContext trans)
1142− aType <- atomTypeForTypeConstructorValidate True tCons tConsMap M.empty
1143− validateAtomType aType tConsMap
1144− pure (Attribute attrName aType)
1146−--convert AttributeExpr to GraphRefAttributeExpr
1147−processAttributeExpr :: AttributeExpr -> TransactionId -> GraphRefAttributeExpr
1148−processAttributeExpr (AttributeAndTypeNameExpr nam tCons ()) tid = AttributeAndTypeNameExpr nam tCons tid
1149−processAttributeExpr (NakedAttributeExpr attr) = NakedAttributeExpr attr
1151−-- convert a RelationalExpr into a GraphRefRelationalExpr
1152−processRelationalExpr :: RelationalExpr -> TransactionId -> GraphRefRelationalExpr
1153−processRelationalExpr (MakeRelationFromExprs mAttrs tupleExprs) =
1154− MakeRelationFromExprs (fmap (fmap processAttributeExpr) mAttrs) (processTupleExprs tupleExprs)