[jira] [Assigned] (HIVE-25749) Check if RelMetadataQuery.collations() return null to avoid NPE

["Alessandro Solimando (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-25749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alessandro Solimando reassigned HIVE-25749:
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> 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
>            Priority: Major
>
> 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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