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https://issues.apache.org/jira/browse/HIVE-7215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028750#comment-14028750
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Prasanth J commented on HIVE-7215:
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ORC handles nulls in predicate pushdown. If an entire column is null in a row
group (10K rows), the statistics in row index entries is null. So for queries
like {code}select * from table where col is null {code} if col is completely
null in a row group, ORC predicate pushdown evaluates to true (based on null
statistics) and reads the row group.
> Support predicate pushdown for null checks in ORCFile
> -----------------------------------------------------
>
> Key: HIVE-7215
> URL: https://issues.apache.org/jira/browse/HIVE-7215
> Project: Hive
> Issue Type: Improvement
> Reporter: Rohini Palaniswamy
>
> Came across this missing feature during discussion of PIG-3760.
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