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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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