Vladimir Sitnikov created CALCITE-4216:
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Summary: Ensure
org.apache.calcite.rel.type.RelDataType#getSqlTypeName is non-null
Key: CALCITE-4216
URL: https://issues.apache.org/jira/browse/CALCITE-4216
Project: Calcite
Issue Type: Sub-task
Components: core
Affects Versions: 1.25.0
Reporter: Vladimir Sitnikov
Existing code treats RelDataType#getSqlTypeName as non-nullable, and
org.apache.calcite.rel.type.RelDataTypeImpl#getSqlTypeName implements the
method as {{return null}}, howeve, RelDataTypeImpl is abstract.
We should make it explicit that getSqlTypeName should be non-null.
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