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https://issues.apache.org/jira/browse/HIVE-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970009#action_12970009
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Namit Jain commented on HIVE-1648:
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1. QBParseInfo: add setDestToLimit() for symmetry()
2. I am not sure any of your tests are working - set hive.stats.autogather =
false
before you create the tables for which you want the stats to be populated while
reading.
Clearly, this is the reason why piggyback_part.q is working.
2. piggyback_join.q
End:
show table extended like piggy_table3;
drop table piggy_table;
Add:
show table extended like piggy_table1;
show table extended like piggy_table2;
Also, add a test where you are joining:
piggyback_table1 a join
piggyback_table2 b on a.key = b.key join
piggyback_table3 c b.key = c.key
and then show table extended all the 3 tables.
3. piggyback_limit.q
add:
show table extended like piggy_table1;
before the end.
It should have no stats
4. piggbyback_subq.q and _union.q are wrong - you need to create new tables,
and then show table extended them at the end, just like other tests.
5.
> Automatically gathering stats when reading a table/partition
> ------------------------------------------------------------
>
> Key: HIVE-1648
> URL: https://issues.apache.org/jira/browse/HIVE-1648
> Project: Hive
> Issue Type: Sub-task
> Reporter: Ning Zhang
> Assignee: Paul Butler
> Attachments: HIVE-1648.2.patch, HIVE-1648.3.patch, HIVE-1648.4.patch,
> HIVE-1648.5.patch, HIVE-1648.patch, hive-1648.svn.patch
>
>
> HIVE-1361 introduces a new command 'ANALYZE TABLE T COMPUTE STATISTICS' to
> gathering stats. This requires additional scan of the data. Stats gathering
> can be piggy-backed on TableScanOperator whenever a table/partition is
> scanned (given not LIMIT operator).
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