Kirill Kozlov created CALCITE-3355:
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Summary: SQLCase nullability check
Key: CALCITE-3355
URL: https://issues.apache.org/jira/browse/CALCITE-3355
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.20.0
Reporter: Kirill Kozlov
When executing queries like:
"SELECT COALESCE(name, 'unknown') as name_out FROM PCOLLECTION"
(input 'name' is nullable)
There is a need to know whether the result is nullable or not (in this case -
not). During validation stage "COALESCE" is being transformed (via
SqlValidatorImpl.performUnconditionalRewrites) into a "CASE" statement, which
currently does not determine nullability of a result.
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