[jira] [Commented] (HIVE-23735) Reducer misestimate for export command

["Ashutosh Chauhan (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-23735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17142978#comment-17142978 ] 

Ashutosh Chauhan commented on HIVE-23735:
-----------------------------------------

+1

> Reducer misestimate for export command
> --------------------------------------
>
>                 Key: HIVE-23735
>                 URL: https://issues.apache.org/jira/browse/HIVE-23735
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-23735.1.wip.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java#L6869
> {code}
> if (dest_tab.getNumBuckets() > 0) {
> ...
> }
> {code}
> For "export" command, HS2 creates a dummy table and for this table and gets "1" as the number of buckets.
> {noformat}
> set hive.stats.autogather=false;
> export table sample_table to '/tmp/export/sampe_db/t1';
> {noformat}
> This causes issues in reducer estimates and always lands up with '1' as the number of reducer task. 



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