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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15056) Support index shifting for struct fields
Date Tue, 01 Nov 2016 16:44:58 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15625955#comment-15625955
] 

ASF GitHub Bot commented on HIVE-15056:
---------------------------------------

Github user sunchao closed the pull request at:

    https://github.com/apache/hive/pull/108


> Support index shifting for struct fields
> ----------------------------------------
>
>                 Key: HIVE-15056
>                 URL: https://issues.apache.org/jira/browse/HIVE-15056
>             Project: Hive
>          Issue Type: Sub-task
>          Components: File Formats, Physical Optimizer, Serializers/Deserializers
>            Reporter: Chao Sun
>            Assignee: Chao Sun
>             Fix For: 2.2.0
>
>         Attachments: HIVE-15056.1.patch, HIVE-15056.2.patch
>
>
> In HIVE-13873, the following case doesn't work:
> {code}
> select s.c from tbl
> {code}
> where {{tbl}} is of schema:
> {code}
> a                   	int
> s                   	struct<b:int,c:string>
> {code}
> This is because currently we generate a "pruned" schema (in terms of {{GroupType}}) for
Parquet reader to scan the data. However, on the Hive side the object inspector still uses
the original schema. In particular, in this case for {{s.c}} the data returned by Parquet
reader is in index 0, but the object inspector tries to read it in index 1. Therefore, in
correct result will be returned.



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