Mehant Baid created CALCITE-547:
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Summary: Fix return type of item operator when operand type is not
known
Key: CALCITE-547
URL: https://issues.apache.org/jira/browse/CALCITE-547
Project: Calcite
Issue Type: Bug
Reporter: Mehant Baid
Assignee: Mehant Baid
While inferring the return type of the item operator (SqlItemOperator.
inferReturnType()) when the SqlTypeName of the operand is ANY we set the
nullability of return type to be false. Since the type of the operand is not
known at this point we cannot know the return type and its nullability.
Setting nullability to false was causing wrong results in Drill when we were
performing count(item op), Calcite would set nullability to be false and the
count(item op) would get replaced with count(0) causing wrong results if the
column is eventually resolved to be nullable and has nulls in it.
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