[Coral-Hive] [Coral-Trino] Make named_struct a Coral IR operator and Migrate GenericProject Function #431
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aastha25
changed the title
yiqiangin
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Jun 30, 2023
| * then the following operation is syntactically and semantically correct in Trino: CAST(colA as trinoTypeStringA) | ||
| */ | ||
| class RelDataTypeToTrinoTypeStringConverter { | ||
| public class RelDataTypeToTrinoTypeStringConverter { |
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May I know why these three classes including TrinoMapTransformValuesFunction and TrinoStructCastRowFunction are converted to public? I don't see any usage of this class in this PR.
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These classes are used in GenericProjectTransformer for example here. Previously GenericProjectTransformer was in the same package as RelDataTypeToTrinoTypeStringConverter but now it's moved to another package.
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What changes are proposed in this pull request, and why are they necessary?
This PR covers two migrations - (1)
named_struct()(2)generic_project()[1]
This PR uses code changes from open PR #412 and adds minor modifications on top of it to be compatible with the new API.
Summary from the PR#412:
This patch removes the transformation from
HiveConvertletTablethat converts named_struct to CAST (ROW() AS ROW()). Instead, it makesnamed_structa Coral IR operator. Engine translations on the RHS are also adapted to accommodate this change. This also eliminates the need to rewrite from CAST (ROW() AS ROW()) to named_struct on the Spark side, because named_struct is now maintained all along. CastToNamedStructTransformer on the Spark side will be removed in a future PR.This PR also introduces a Trino transformer,
NamedStructToCastTransformer, which converts the Coral IR operator:named_structto its equivalent Trino compatible operator.This PR should address #357 and also unblocks migration of CONCAT operator here #378
[2]
This PR also migrates the Rel transformer:
GenericProjectToTrinoConverterto a SqlCall transformer:GenericProjectTransformer.How was this patch tested?
./gradlew build
updated & added UTs
tested with production views for spark, avro, trino