Stamatis Zampetakis created CALCITE-2464:
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Summary: Struct types are always not nullable
Key: CALCITE-2464
URL: https://issues.apache.org/jira/browse/CALCITE-2464
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.17.0
Reporter: Stamatis Zampetakis
Assignee: Julian Hyde
Struct types are always not nullable. This can lead to bugs in many parts of
Calcite (e.g., expression simplification, optimization, code generation) that
are considering the nullability of a RelDataType.
The method
[isNullable|https://github.com/apache/calcite/blob/3c6b5ec759caadabb67f09d7a4963cc7d9386d0c/core/src/main/java/org/apache/calcite/rel/type/RelRecordType.java#L55]
in the RelRecordType, which is used to represent a structured type, always
returns false. The nullability of the RelRecordType should be a parameter in
the constructor as it is the case for various other RelDataTypes.
Additionally, the data type cache should also take into account the nullability
of the type in order to return a correct equivalent.
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