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