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https://issues.apache.org/jira/browse/HIVE-3289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13422992#comment-13422992
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Namit Jain commented on HIVE-3289:
----------------------------------
I think, the discussion to use phabricator/review board/patch should be done on
the dev mailing list, instead of this jira.
> sort merge join may not work silently
> -------------------------------------
>
> Key: HIVE-3289
> URL: https://issues.apache.org/jira/browse/HIVE-3289
> Project: Hive
> Issue Type: Bug
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: hive.3289.1.patch
>
>
> The user does not know, if the sort-merge join is working or not.
> create table table_asc(key int, value string) CLUSTERED BY (key) SORTED BY
> (key asc)
> INTO 1 BUCKETS STORED AS RCFILE;
> create table table_desc(key int, value string) CLUSTERED BY (key) SORTED BY
> (key desc)
> INTO 1 BUCKETS STORED AS RCFILE;
> set hive.enforce.sorting = true;
> insert overwrite table table_asc select key, value from src;
> insert overwrite table table_desc select key, value from src;
> set hive.optimize.bucketmapjoin = true;
> set hive.optimize.bucketmapjoin.sortedmerge = true;
> set hive.input.format =
> org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat;
> explain
> select /*+mapjoin(a)*/ * from table_asc a join table_desc b on a.key = b.key;
> select /*+mapjoin(a)*/ * from table_asc a join table_desc b on a.key = b.key;
> explain
> select /*+mapjoin(b)*/ * from table_asc a join table_desc b on a.key = b.key;
> select /*+mapjoin(b)*/ * from table_asc a join table_desc b on a.key = b.key;
> In the above test, the sort-merge join is not obeyed as expected.
> If you user explicitly asked for sort-merge join, and it is not being
> obeyed, the operation should fail.
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