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

[Rajesh Balamohan (Jira)]

Rajesh Balamohan created HIVE-23735:
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             Summary: 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


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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