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Posted to issues@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2016/01/06 20:10:40 UTC
[jira] [Commented] (HIVE-12657) selectDistinctStar.q results differ
with jdk 1.7 vs jdk 1.8
[ https://issues.apache.org/jira/browse/HIVE-12657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15086085#comment-15086085 ]
Sergey Shelukhin commented on HIVE-12657:
-----------------------------------------
It appears the the column order is changed. Is column order defined for select *? If not, that is not a problem; I suspect it is, and anyway it would be nice if it was consistent. My telepathic debugging powers tell me that the code is using a hashset/map somewhere to achieve the "distinct" part, and the order change is expected because that is not ordered and ordering is known to be different in different jdks.
We need to replace that with linkedhashset.
> selectDistinctStar.q results differ with jdk 1.7 vs jdk 1.8
> -----------------------------------------------------------
>
> Key: HIVE-12657
> URL: https://issues.apache.org/jira/browse/HIVE-12657
> Project: Hive
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Prasanth Jayachandran
>
> Encountered this issue when analysing test failures of HIVE-12609. selectDistinctStar.q produces the following diff when I ran with java version "1.7.0_55" and java version "1.8.0_60"
> {code}
> < 128 val_128 128
> ---
> > 128 128 val_128
> 1770c1770
> < 224 val_224 224
> ---
> > 224 224 val_224
> 1776c1776
> < 369 val_369 369
> ---
> > 369 369 val_369
> 1799,1810c1799,1810
> < 146 val_146 146 val_146 146 val_146 2008-04-08 11
> < 150 val_150 150 val_150 150 val_150 2008-04-08 11
> < 213 val_213 213 val_213 213 val_213 2008-04-08 11
> < 238 val_238 238 val_238 238 val_238 2008-04-08 11
> < 255 val_255 255 val_255 255 val_255 2008-04-08 11
> < 273 val_273 273 val_273 273 val_273 2008-04-08 11
> < 278 val_278 278 val_278 278 val_278 2008-04-08 11
> < 311 val_311 311 val_311 311 val_311 2008-04-08 11
> < 401 val_401 401 val_401 401 val_401 2008-04-08 11
> < 406 val_406 406 val_406 406 val_406 2008-04-08 11
> < 66 val_66 66 val_66 66 val_66 2008-04-08 11
> < 98 val_98 98 val_98 98 val_98 2008-04-08 11
> ---
> > 146 val_146 2008-04-08 11 146 val_146 146 val_146
> > 150 val_150 2008-04-08 11 150 val_150 150 val_150
> > 213 val_213 2008-04-08 11 213 val_213 213 val_213
> > 238 val_238 2008-04-08 11 238 val_238 238 val_238
> > 255 val_255 2008-04-08 11 255 val_255 255 val_255
> > 273 val_273 2008-04-08 11 273 val_273 273 val_273
> > 278 val_278 2008-04-08 11 278 val_278 278 val_278
> > 311 val_311 2008-04-08 11 311 val_311 311 val_311
> > 401 val_401 2008-04-08 11 401 val_401 401 val_401
> > 406 val_406 2008-04-08 11 406 val_406 406 val_406
> > 66 val_66 2008-04-08 11 66 val_66 66 val_66
> > 98 val_98 2008-04-08 11 98 val_98 98 val_98
> 4212c4212
> {code}
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