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https://issues.apache.org/jira/browse/HIVE-2451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108358#comment-13108358
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Hudson commented on HIVE-2451:
------------------------------
Integrated in Hive-trunk-h0.21 #965 (See
[https://builds.apache.org/job/Hive-trunk-h0.21/965/])
HIVE-2451: TABLESAMBLE(BUCKET xxx) sometimes doesn't trigger input pruning
(Siying Dong via He Yongqiang)
heyongqiang :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1172891
Files :
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/SamplePruner.java
* /hive/trunk/ql/src/test/results/clientpositive/sample10.q.out
* /hive/trunk/ql/src/test/results/clientpositive/sample2.q.out
* /hive/trunk/ql/src/test/results/clientpositive/sample4.q.out
* /hive/trunk/ql/src/test/results/clientpositive/sample6.q.out
* /hive/trunk/ql/src/test/results/clientpositive/sample9.q.out
* /hive/trunk/ql/src/test/results/compiler/plan/sample2.q.xml
* /hive/trunk/ql/src/test/results/compiler/plan/sample4.q.xml
* /hive/trunk/ql/src/test/results/compiler/plan/sample6.q.xml
> TABLESAMBLE(BUCKET xxx) sometimes doesn't trigger input pruning as regression
> of HIVE-1538
> ------------------------------------------------------------------------------------------
>
> Key: HIVE-2451
> URL: https://issues.apache.org/jira/browse/HIVE-2451
> Project: Hive
> Issue Type: Bug
> Reporter: Siying Dong
> Assignee: Siying Dong
> Attachments: HIVE-2451.1.patch, HIVE-2451.2.patch, HIVE-2451.3.patch
>
>
> Example:
> select count(1) from <bucket_table> TABLESAMPLE(BUCKET xxx out of yyy) where
> <partition_column> = 'xxx'
> will not trigger input pruning.
> The reason is that we assume sample filtering operator only happens as the
> second filter after table scan, which is broken by HIVE-1538, even if the
> feature doesn't turn on.
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