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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-14885) Support PPD for nested columns
Date Tue, 04 Oct 2016 17:07:22 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15545992#comment-15545992
] 

Xuefu Zhang commented on HIVE-14885:
------------------------------------

cc: [~zshao], [~Ferd], [~spena]

> Support PPD for nested columns
> ------------------------------
>
>                 Key: HIVE-14885
>                 URL: https://issues.apache.org/jira/browse/HIVE-14885
>             Project: Hive
>          Issue Type: Improvement
>          Components: Logical Optimizer, Serializers/Deserializers
>    Affects Versions: 2.1.0
>            Reporter: Xuefu Zhang
>
> It looks like that PPD doesn't work for nested columns, at least not for Parquet. For
a given schema
> {code}
> hive> desc nested;
> OK
> a                   	int                 	                    
> b                   	string              	                    
> c                   	struct<d:int,e:string>	                    
> {code}
> PPD works for a query like
> {code}
> select * from nested where a=1;
> {code}
> while NOT for
> {code}
> select * from nested where c.d=2;
> {code}



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