dylanhz created FLINK-38841:
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Summary: Nullability is lost in FamilyArgumentStrategy
Key: FLINK-38841
URL: https://issues.apache.org/jira/browse/FLINK-38841
Project: Flink
Issue Type: Bug
Components: Table SQL / Planner
Reporter: dylanhz
Currently, in FamilyArgumentStrategy#inferArgumentType, if the actualType
belongs to the expectedFamily, the method returns the actualDataType directly,
ignoring the expectedNullability constraint.
{code:java}
// type is part of the family
if (actualType.getTypeRoot().getFamilies().contains(expectedFamily)) {
return Optional.of(actualDataType);
}
{code}
This behavior is inconsistent with RootArgumentStrategy, where the
expectedNullability is strictly enforced.
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