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https://issues.apache.org/jira/browse/HIVE-11548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14717557#comment-14717557
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Mithun Radhakrishnan commented on HIVE-11548:
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Alright. I was able to reproduce the
{{TestHCatClient.testTableSchemaPropagation()}} problem. It seems to fail
without this patch, so I'll work on that in a separate JIRA. I'm still having
trouble getting {{TestPigHBaseStorageHandler}} to fail.
> HCatLoader should support predicate pushdown.
> ---------------------------------------------
>
> Key: HIVE-11548
> URL: https://issues.apache.org/jira/browse/HIVE-11548
> Project: Hive
> Issue Type: New Feature
> Components: HCatalog
> Reporter: Mithun Radhakrishnan
> Assignee: Mithun Radhakrishnan
> Attachments: HIVE-11548.1.patch
>
>
> When one uses {{HCatInputFormat}}/{{HCatLoader}} to read from file-formats
> that support predicate pushdown (such as ORC, with
> {{hive.optimize.index.filter=true}}), one sees that the predicates aren't
> actually pushed down into the storage layer.
> The forthcoming patch should allow for filter-pushdown, if any of the
> partitions being scanned with {{HCatLoader}} support the functionality. The
> patch should technically allow the same for users of {{HCatInputFormat}}, but
> I don't currently have a neat interface to build a compound
> predicate-expression. Will add this separately, if required.
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