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https://issues.apache.org/jira/browse/HIVE-19615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488115#comment-16488115
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Gunther Hagleitner commented on HIVE-19615:
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[~bslim] see vote on hive dev mailing list. "Unrelated" is no longer good
enough for commit.
> Proper handling of is null and not is null predicate when pushed to Druid
> -------------------------------------------------------------------------
>
> Key: HIVE-19615
> URL: https://issues.apache.org/jira/browse/HIVE-19615
> Project: Hive
> Issue Type: Bug
> Reporter: slim bouguerra
> Assignee: slim bouguerra
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-19615.2.patch, HIVE-19615.3.patch, HIVE-19615.patch
>
>
> Recent development in Druid introduced new semantic of null handling
> [here|https://github.com/b-slim/druid/commit/219e77aeac9b07dc20dd9ab2dd537f3f17498346]
> Based on those changes when need to honer push down of expressions with is
> null/ is not null predicates.
> The prosed fix overrides the mapping of Calcite Function to Druid Expression
> to much the correct semantic.
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