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From "Nemon Lou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13602) TPCH q16 return wrong result when CBO is on
Date Mon, 25 Apr 2016 06:41:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15255964#comment-15255964
] 

Nemon Lou commented on HIVE-13602:
----------------------------------

>From calcite rel plan ,we can see the p_brand column is declared to fetch.
And the value for p_brand column is zero in the final result.
{noformat}
0: jdbc:hive2://189.39.151.141:21066/> select * from q16_cbo_bad limit 1;
+------------------------+-----------------------+-----------------------+-----------------------------+--+
| q16_cbo_bad.p_brand  | q16_cbo_bad.p_type  | q16_cbo_bad.p_size  | q16_cbo_bad.supplier_cnt
 |
+------------------------+-----------------------+-----------------------+-----------------------------+--+
| 0                      | MEDIUM BRUSHED TIN    | 21                    | 298           
             |
+------------------------+-----------------------+-----------------------+-----------------------------+--+
1 row selected (0.139 seconds)
0: jdbc:hive2://189.39.151.141:21066/> select * from q16_cbo_rewrite limit 1;
+----------------------------+---------------------------+---------------------------+---------------------------------+--+
| q16_cbo_rewrite.p_brand  | q16_cbo_rewrite.p_type  | q16_cbo_rewrite.p_size  | q16_cbo_rewrite.supplier_cnt
 |
+----------------------------+---------------------------+---------------------------+---------------------------------+--+
| Brand#31                   | PROMO ANODIZED NICKEL     | 14                        | 40
                             |
+----------------------------+---------------------------+---------------------------+---------------------------------+--+
1 row selected (0.961 seconds)
{noformat}

> TPCH q16 return wrong result when CBO is on
> -------------------------------------------
>
>                 Key: HIVE-13602
>                 URL: https://issues.apache.org/jira/browse/HIVE-13602
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO, Logical Optimizer
>    Affects Versions: 1.2.1
>            Reporter: Nemon Lou
>            Assignee: Pengcheng Xiong
>         Attachments: calcite_cbo_bad.out, calcite_cbo_good.out, explain_cbo_bad_part1.out,
explain_cbo_bad_part2.out, explain_cbo_bad_part3.out, explain_cbo_good(rewrite)_part1.out,
explain_cbo_good(rewrite)_part2.out, explain_cbo_good(rewrite)_part3.out
>
>
> Running tpch with factor 2, 
> q16 returns 1,160 rows when CBO is on,
> while returns 59,616 rows when CBO is off.
> See attachment for detail .



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