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https://issues.apache.org/jira/browse/HIVE-15056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15622616#comment-15622616
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Chao Sun commented on HIVE-15056:
---------------------------------

Committed to the master branch. Thanks [~Ferd] for the review!

> 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: 2.1.1
>
>         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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