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From "Mithun Radhakrishnan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11548) HCatLoader should support predicate pushdown.
Date Wed, 02 Sep 2015 23:15:45 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mithun Radhakrishnan updated HIVE-11548:
----------------------------------------
    Attachment: HIVE-11548.2.patch

Fixed failing tests. {{TestHCatClient}} needed fixing independently of this fix. I'm squeezing
it into this JIRA.

> 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, HIVE-11548.2.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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