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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5304) JDO and SQL filters can both return different results for string compares depending on underlying datastore
Date Tue, 17 Sep 2013 20:47:51 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13769931#comment-13769931
] 

Sergey Shelukhin commented on HIVE-5304:
----------------------------------------

Actually, all names - I see show indexes order also changes in some queries, etc.
                
> JDO and SQL filters can both return different results for string compares depending on
underlying datastore
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-5304
>                 URL: https://issues.apache.org/jira/browse/HIVE-5304
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>            Reporter: Sergey Shelukhin
>
> Hive uses JDOQL filters to optimize partition retrieval; recently direct SQL was added
to optimize it further. Both of these methods may end up pushing StringCol op 'SomeString'
to underlying SQL datastore. Many paths also pushes order by-s, although these are not as
problematic.
> The problem is that different datastores handle string compares differently. 
> While testing on Postgres, I see that results in different things, from innocent like
order changes in "show partitions", to more serious like 
> {code}
>  alter table ptestfilter drop partition (c>='US', d<='2')
> {code}
> in drop_partitions_filter.q - in Derby, with which the .q.out file was generated, it
drops "c=Uganda/d=2"; this also passes on MySQL (I ran tests with autocreated db); on Postgres
with a db from the script it doesn't.
> Looks like we need to enforce collation in partition names and part_key_values-es; both
in the create scripts, as well as during autocreate (via package.jdo?)

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