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From "Sergey Shelukhin (JIRA)" <>
Subject [jira] [Commented] (HIVE-8395) CBO: enable by default
Date Fri, 14 Nov 2014 22:36:34 GMT


Sergey Shelukhin commented on HIVE-8395:

>From memory... 
For most join tests, the problem is that 3-way join gets split into 2 stages. It doesn't happen
in all cases and it was decided to investigate later.
constprog2 may be re-enable-able; again non-critical, some particularly obscure const propagation
does not happen due to plan changes.
Infer_bucket_sort*, optimize_nullscan, subquery_* have changes because they depends on particularly
crafted plans to test specific scenarios, and  CBO changes the plan, should not be an issue.
For list bucketing plans change with CBO, but we decided we don't care, someone might need
to investigate, it's a rarely if ever used feature.
partition_wise_fileformat2 I don't remember.
ql_rewrite_gbtoidx had hard-to-fix obscure index usage issues (index not used for 1 query),
deemed not important enough/can be fixed later.
test5.q no idea.

> CBO: enable by default
> ----------------------
>                 Key: HIVE-8395
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>             Fix For: 0.15.0
>         Attachments: HIVE-8395.01.patch, HIVE-8395.02.patch, HIVE-8395.03.patch, HIVE-8395.04.patch,
HIVE-8395.05.patch, HIVE-8395.06.patch, HIVE-8395.07.patch, HIVE-8395.08.patch, HIVE-8395.09.patch,
HIVE-8395.10.patch, HIVE-8395.11.patch, HIVE-8395.12.patch, HIVE-8395.12.patch, HIVE-8395.13.patch,
HIVE-8395.13.patch, HIVE-8395.14.patch, HIVE-8395.15.patch, HIVE-8395.16.patch, HIVE-8395.17.patch,
HIVE-8395.18.patch, HIVE-8395.18.patch, HIVE-8395.19.patch, HIVE-8395.20.patch, HIVE-8395.21.patch,
HIVE-8395.22.patch, HIVE-8395.23.patch, HIVE-8395.patch

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