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https://issues.apache.org/jira/browse/HIVE-21599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17633894#comment-17633894
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Stamatis Zampetakis commented on HIVE-21599:
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For more information about \{{getRequestedSchema}} and the relation with column
pruning check the following method:
https://github.com/apache/hive/blob/a832e8a3ad88dd367dab8d2e3fcabba5ec51e4cd/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/read/DataWritableReadSupport.java#L460
> Parquet predicate pushdown on partition columns may cause wrong result if
> files contain partition columns
> ---------------------------------------------------------------------------------------------------------
>
> Key: HIVE-21599
> URL: https://issues.apache.org/jira/browse/HIVE-21599
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Reporter: Vineet Garg
> Assignee: Soumyakanti Das
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-21599.1.patch
>
> Time Spent: 3h 20m
> Remaining Estimate: 0h
>
> Filter predicates are pushed to Table Scan (to be pushed to and used by
> storage handler/input format). Such predicates could consist of partition
> columns which are of no use to storage handler or input formats. Therefore
> it should be removed from TS filter expression.
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