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From "Prasanth J (JIRA)" <>
Subject [jira] [Commented] (HIVE-7589) Some fixes and improvements to statistics annotation rules
Date Mon, 04 Aug 2014 22:53:11 GMT


Prasanth J commented on HIVE-7589:

[~gopalv] I will put the fix for HIVE-7156 once this patch gets in. Since these small fixes
affect many q file tests, I don't want HIVE-7156 add to the diff changes. It will be hard
to understand what changes causes the diff in stats. 

> Some fixes and improvements to statistics annotation rules
> ----------------------------------------------------------
>                 Key: HIVE-7589
>                 URL:
>             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
> 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

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