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From "Ferdinand Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15507) Nested column pruning: fix issue when selecting struct field from array/map element
Date Fri, 30 Dec 2016 01:16:58 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15786564#comment-15786564
] 

Ferdinand Xu commented on HIVE-15507:
-------------------------------------

Sorry for my late response. Thanks [~csun] for the patch. LGTM +1

> Nested column pruning: fix issue when selecting struct field from array/map element
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-15507
>                 URL: https://issues.apache.org/jira/browse/HIVE-15507
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Logical Optimizer, Physical Optimizer, Serializers/Deserializers
>    Affects Versions: 2.2.0
>            Reporter: Chao Sun
>            Assignee: Chao Sun
>         Attachments: 15507.1.patch
>
>
> When running the following query:
> {code}
> SELECT count(col), arr[0].f
> FROM tbl
> GROUP BY arr[0].f
> {code}
> where {{arr}} is an array of struct with field {{f}}. Nested column pruning will fail.
This is because we currently process {{GenericUDFIndex}} in the same way as any other UDF.
In this case, it will generate path {{arr.f}}, which will not match the struct type info when
doing the pruning.
> Same thing for map.



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