mirror of
https://github.com/circuithub/rel8.git
synced 2024-08-16 11:20:23 +03:00
Add ability to use custom aggregation functions with aggregateFunction
(#283)
This commit is contained in:
parent
91e7a1bfab
commit
b5789a692e
@ -0,0 +1,3 @@
|
||||
### Added
|
||||
|
||||
- `aggregationFunction`, which allows custom aggregation functions to be used.
|
@ -70,6 +70,7 @@ library
|
||||
other-modules:
|
||||
Rel8.Aggregate
|
||||
Rel8.Aggregate.Fold
|
||||
Rel8.Aggregate.Function
|
||||
|
||||
Rel8.Column
|
||||
Rel8.Column.ADT
|
||||
|
@ -284,6 +284,7 @@ module Rel8
|
||||
, countWhere, countWhereOn
|
||||
, and, andOn
|
||||
, or, orOn
|
||||
, aggregateFunction
|
||||
|
||||
, mode, modeOn
|
||||
, percentile, percentileOn
|
||||
@ -383,6 +384,7 @@ import Prelude ()
|
||||
-- rel8
|
||||
import Rel8.Aggregate
|
||||
import Rel8.Aggregate.Fold
|
||||
import Rel8.Aggregate.Function
|
||||
import Rel8.Column
|
||||
import Rel8.Column.ADT
|
||||
import Rel8.Column.Either
|
||||
|
40
src/Rel8/Aggregate/Function.hs
Normal file
40
src/Rel8/Aggregate/Function.hs
Normal file
@ -0,0 +1,40 @@
|
||||
{-# language FlexibleContexts #-}
|
||||
{-# language MonoLocalBinds #-}
|
||||
|
||||
module Rel8.Aggregate.Function (
|
||||
aggregateFunction,
|
||||
) where
|
||||
|
||||
-- base
|
||||
import Prelude
|
||||
|
||||
-- opaleye
|
||||
import qualified Opaleye.Internal.Aggregate as Opaleye
|
||||
import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
|
||||
|
||||
-- rel8
|
||||
import Rel8.Aggregate (Aggregator1, unsafeMakeAggregator)
|
||||
import Rel8.Aggregate.Fold (Fallback (Empty))
|
||||
import Rel8.Expr (Expr)
|
||||
import Rel8.Expr.Opaleye (castExpr, fromColumn, fromPrimExpr)
|
||||
import Rel8.Schema.Null (Sql)
|
||||
import Rel8.Schema.QualifiedName (QualifiedName, showQualifiedName)
|
||||
import Rel8.Table (Table)
|
||||
import Rel8.Table.Opaleye (unpackspec)
|
||||
import Rel8.Type (DBType)
|
||||
|
||||
|
||||
-- | 'aggregateFunction' allows the use use of custom aggregation functions
|
||||
-- or PostgreSQL aggregation functions which are not otherwise supported by
|
||||
-- Rel8.
|
||||
aggregateFunction ::
|
||||
(Table Expr i, Sql DBType a) =>
|
||||
QualifiedName ->
|
||||
Aggregator1 i (Expr a)
|
||||
aggregateFunction name =
|
||||
unsafeMakeAggregator
|
||||
id
|
||||
(castExpr . fromPrimExpr . fromColumn)
|
||||
Empty
|
||||
(Opaleye.makeAggrExplicit unpackspec
|
||||
(Opaleye.AggrOther (showQualifiedName name)))
|
Loading…
Reference in New Issue
Block a user