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https://issues.apache.org/jira/browse/HIVE-1372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874352#action_12874352
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John Sichi commented on HIVE-1372:
----------------------------------
Mayank, I'm getting test failures due to trailing digit diffs when running
through groupby3.q and groupby3_noskew.q. If they are OK, you can just submit
a new patch including an updated .q.out for both tests.
[junit] diff -a -I file: -I /tmp/ -I invalidscheme: -I lastUpdateTime -I
lastAccessTime -I owner -I transient_lastDdlTime -I java.lang.RuntimeException
-I at org -I at sun -I at java -I at junit -I Caused by: -I [.][.][.] [0-9]*
more
/data/users/jsichi/open/commit-trunk/build/ql/test/logs/clientpositive/groupby3.q.out
/data/users/jsichi/open/commit-trunk/ql/src/test/results/clientpositive/groupby3.q.out
[junit] 240c240
[junit] < 130091.0 260.182 256.10355987055016 98.0 0.0
142.92680950752379 143.06995106518903 20428.07287599999
20469.010897795582
[junit] ---
[junit] > 130091.0 260.182 256.10355987055016 98.0 0.0
142.92680950752379 143.06995106518903 20428.072875999995
20469.010897795586
> New algorithm for variance() UDAF
> ---------------------------------
>
> Key: HIVE-1372
> URL: https://issues.apache.org/jira/browse/HIVE-1372
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.6.0
> Reporter: Mayank Lahiri
> Assignee: Mayank Lahiri
> Priority: Minor
> Fix For: 0.6.0
>
> Attachments: HIVE-1372.2.patch, HIVE-1372.patch
>
>
> A new algorithm for the UDAF that computes variance. This is pretty much a
> drop-in replacement for the current UDAF, and has two benefits: provably
> numerically stable (reference included in comments), and reduces arithmetic
> operations by about half.
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