Alessandro Solimando created HIVE-25749:
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Summary: Check if RelMetadataQuery.collations() return null to
avoid NPE
Key: HIVE-25749
URL: https://issues.apache.org/jira/browse/HIVE-25749
Project: Hive
Issue Type: Bug
Components: CBO, Query Planning
Affects Versions: 4.0.0
Reporter: Alessandro Solimando
Assignee: Alessandro Solimando
Accoring to "RelMetadataQuery.collations()"
[javadoc|https://github.com/apache/calcite/blob/calcite-1.25.0/core/src/main/java/org/apache/calcite/rel/metadata/RelMetadataQuery.java#L537],
the method can return "null" if collactions information are not available.
Hive invokes the method in two places
([RelFieldTrimmer|https://github.com/apache/hive/blob/1046f41ea36ab3c8b036481128ba9b76dda2882a/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/RelFieldTrimmer.java#L192]
and
[HiveJoin|https://github.com/apache/hive/blob/1046f41ea36ab3c8b036481128ba9b76dda2882a/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/reloperators/HiveJoin.java#L206]),
but it does not check for "null" return values, which can cause NPE.
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