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