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https://issues.apache.org/jira/browse/HIVE-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15607039#comment-15607039
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ASF GitHub Bot commented on HIVE-13873:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/hive/pull/105
> Support column pruning for struct fields in select statement
> ------------------------------------------------------------
>
> Key: HIVE-13873
> URL: https://issues.apache.org/jira/browse/HIVE-13873
> Project: Hive
> Issue Type: Sub-task
> Components: Logical Optimizer
> Reporter: Xuefu Zhang
> Assignee: Ferdinand Xu
> Attachments: HIVE-13873.1.patch, HIVE-13873.2.patch,
> HIVE-13873.3.patch, HIVE-13873.4.patch, HIVE-13873.5.patch,
> HIVE-13873.6.patch, HIVE-13873.patch, HIVE-13873.wip.patch
>
>
> This is the grounding work for the nested column pruning in Hive, for Parquet
> format. In this patch, we address the case for struct type in select
> statements. In particular, for queries such as:
> {code}
> select s.a from tbl
> {code}
> where {{tbl}} has schema:
> {code}
> s:struct<a:int, b:boolean, c:array<int>>
> {code}
> then only the field {{a}} should have been scanned in the Parquet reader,
> while field {{b}} and {{c}} can be ignored.
> Future work includes support other types of statements, as well as more
> combinations of types (e.g., selecting fields of array type inside a struct
> type).
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