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