Vladimir Ciobanu da8f6981d4 server: reduce the number of backend dispatches ... Fixes https://github.com/hasura/graphql-engine-mono/issues/712 Main point of interest: the `Hasura.SQL.Backend` module. This PR creates an `Exists` type indexed by indexed type and packed constraint while hiding all of its complexity by not exporting the constructor. Existential constructors/types which are no longer (directly) existential: - [X] BackendSourceInfo :: BackendSourceInfo - [x] BackendSourceMetadata :: BackendSourceMetadata - [x] MOSourceObjId :: MetadatObjId - [x] SOSourceObj :: SchemaObjId - [x] RFDB :: RootField - [x] LQP :: LiveQueryPlan - [x] ExecutionStep :: ExecStepDB This PR also removes ALL usages of `Typeable.cast` from our codebase. We still need to derive `Typeable` in a few places in order to be able to derive `Data` in one place. I have not dug deeper to see why this is needed. GitOrigin-RevId: bb47e957192e4bb0af4c4116aee7bb92f7983445		2021-03-15 13:03:55 +00:00
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DDL	server: reduce the number of backend dispatches	2021-03-15 13:03:55 +00:00
Execute	[Preview] Inherited roles for postgres read queries	2021-03-08 11:15:10 +00:00
Instances	server: reduce the number of backend dispatches	2021-03-15 13:03:55 +00:00
SQL	server: support ltree operators (close #625)	2021-02-25 11:06:49 +00:00
Translate	server: reduce the number of backend dispatches	2021-03-15 13:03:55 +00:00
Connection.hs	update docs link to avoid redirects	2021-03-01 18:51:18 +00:00
DDL.hs	server: add MSSQL support	2021-02-23 17:38:36 +00:00