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https://issues.apache.org/jira/browse/HIVE-17851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Deepak Jaiswal reassigned HIVE-17851:
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> Bucket Map Join : Pick correct number of buckets
> ------------------------------------------------
>
> Key: HIVE-17851
> URL: https://issues.apache.org/jira/browse/HIVE-17851
> Project: Hive
> Issue Type: Bug
> Reporter: Deepak Jaiswal
> Assignee: Deepak Jaiswal
>
> CREATE TABLE tab_part (key int, value string) PARTITIONED BY(ds STRING)
> CLUSTERED BY (key) INTO 2 BUCKETS STORED AS TEXTFILE;
> CREATE TABLE tab(key int, value string) PARTITIONED BY(ds STRING) CLUSTERED
> BY (key) INTO 4 BUCKETS STORED AS TEXTFILE;
> select a.key, a.value, b.value
> from tab a join tab_part b on a.key = b.key;
> In above case, if tab_part is bigger then it should be the streaming side and
> the smaller side should create two hash tables. However, currently, it
> blindly picks 4 as number of buckets as it is the maximum number of buckets
> among all the tables involved in the join and create 4 hash tables.
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