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Posted to issues@hive.apache.org by "Hari Sankar Sivarama Subramaniyan (JIRA)" <ji...@apache.org> on 2016/01/13 22:23:39 UTC
[jira] [Updated] (HIVE-11634) Support partition pruning for
IN(STRUCT(partcol, nonpartcol..)...)
[ https://issues.apache.org/jira/browse/HIVE-11634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hari Sankar Sivarama Subramaniyan updated HIVE-11634:
-----------------------------------------------------
Labels: (was: TODOC1.3)
> 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
> Fix For: 2.0.0
>
> Attachments: HIVE-11634.1.patch, HIVE-11634.2.patch, HIVE-11634.3.patch, HIVE-11634.4.patch, HIVE-11634.5.patch, HIVE-11634.6.patch, HIVE-11634.7.patch, HIVE-11634.8.patch, HIVE-11634.9.patch, HIVE-11634.91.patch, HIVE-11634.92.patch, HIVE-11634.93.patch, HIVE-11634.94.patch, HIVE-11634.95.patch, HIVE-11634.96.patch, HIVE-11634.97.patch, HIVE-11634.98.patch, HIVE-11634.99.patch, HIVE-11634.990.patch, HIVE-11634.991.patch, HIVE-11634.992.patch, HIVE-11634.993.patch, HIVE-11634.994.patch, HIVE-11634.995.patch, HIVE-11634.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.
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