[
https://issues.apache.org/jira/browse/HIVE-7589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085461#comment-14085461
]
Gopal V commented on HIVE-7589:
-------------------------------
[~prasanth_j]: HIVE-7156 isn't critical. We can revisit it, if it gets too
complex to estimate map.aggr performance.
> Some fixes and improvements to statistics annotation rules
> ----------------------------------------------------------
>
> Key: HIVE-7589
> URL: https://issues.apache.org/jira/browse/HIVE-7589
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor, Statistics
> Affects Versions: 0.14.0
> Reporter: Prasanth J
> Assignee: Prasanth J
> Attachments: HIVE-7589.1.patch, HIVE-7589.2.patch
>
>
> *FIXES:*
> 1) JOIN rule does not properly propagate the column statistics from its parent
> 2) Multi-way join rule computes the denominator for #rows estimation wrongly
> 3) GROUPBY rule does not account for the data size of aggregate column
> 4) Prefix removal from column names isn't working
> 5) GROUPBY rule looks at missing column statistics for aggregate column from
> its parent and assumes PARTIAL column stats state
> *IMPROVEMENTS:*
> 1) Replace "EXPLAIN EXTENDED" with "EXPLAIN" in test cases to make the golden
> files easy to comprehend and to reduce verbosity
> 2) Introduce rule for ReduceSink operator which only does renaming of column
> statistics as per output row schema
> 3) Add more rows to the test datasets to avoid 0 row scenario in join test
> cases
> 4) JOIN rule improvement to avoid long overflow
--
This message was sent by Atlassian JIRA
(v6.2#6252)
