HIVE-27070: Multiple is NULL check together fails in CalcitePlanner#6550
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LGTM! Thanks for the PR @soumyakanti3578 !
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…pache#6550) (cherry picked from commit 9e38b8a)
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What changes were proposed in this pull request?
Added a new interface
NonNullableReturnTypeUDFto identify UDFs with a non-nullable return type.When a NonNullableReturnTypeUDF is identified in
HiveFunctionHelper.getReturnType, we can create the return type with nullability set tofalse.Currently
GenericUDFOPNullandGenericUDFOPNotNullimplements the interface.Why are the changes needed?
Calcite has a Strong policy where it validates and asserts that the output of a function like
IS NULLhas a non-nullable return type. This is done in RexSimplify.validateStrongPolicyJira: HIVE-27070
Does this PR introduce any user-facing change?
No
How was this patch tested?