[
https://issues.apache.org/jira/browse/HIVE-11634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14715511#comment-14715511
]
Ashutosh Chauhan commented on HIVE-11634:
-----------------------------------------
We need to remove that, otherwise it cant be guaranteed that this patch
*really* works.
> Support partition pruning for IN(STRUCT(partcol, nonpartcol..)...)
> ------------------------------------------------------------------
>
> Key: HIVE-11634
> URL: https://issues.apache.org/jira/browse/HIVE-11634
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Reporter: Hari Sankar Sivarama Subramaniyan
> Assignee: Hari Sankar Sivarama Subramaniyan
> Attachments: HIVE-11634.1.patch, HIVE-11634.2.patch,
> HIVE-11634.3.patch
>
>
> Currently, we do not support partition pruning for the following scenario
> {code}
> create table pcr_t1 (key int, value string) partitioned by (ds string);
> insert overwrite table pcr_t1 partition (ds='2000-04-08') select * from src
> where key < 20 order by key;
> insert overwrite table pcr_t1 partition (ds='2000-04-09') select * from src
> where key < 20 order by key;
> insert overwrite table pcr_t1 partition (ds='2000-04-10') select * from src
> where key < 20 order by key;
> explain extended select ds from pcr_t1 where struct(ds, key) in
> (struct('2000-04-08',1), struct('2000-04-09',2));
> {code}
> If we run the above query, we see that all the partitions of table pcr_t1 are
> present in the filter predicate where as we can prune partition
> (ds='2000-04-10').
> The optimization is to rewrite the above query into the following.
> {code}
> explain extended select ds from pcr_t1 where (struct(ds)) IN
> (struct('2000-04-08'), struct('2000-04-09')) and struct(ds, key) in
> (struct('2000-04-08',1), struct('2000-04-09',2));
> {code}
> The predicate (struct(ds)) IN (struct('2000-04-08'), struct('2000-04-09'))
> is used by partition pruner to prune the columns which otherwise will not be
> pruned.
> This is an extension of the idea presented in HIVE-11573.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
