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https://issues.apache.org/jira/browse/HIVE-6348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rui Li updated HIVE-6348:
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Attachment: HIVE-6348.4.patch
Patch v4 updates the affected tests.
# I modified {{input20_script.py}} so it doesn't expect ordered input and gives
the same results.
# I disabled the optimization in {{correlationoptimizer14.q}} and
{{reduce_deduplicate_extended.q}}. Otherwise most of the test cases in these
two qfiles become pointless.
# For {{concat_op.q}}, I removed the collect_list UDF in output. Because the
column order in the list is not guaranteed.
Other golden files only have changes in query plan, not the results. Will add
an RB for this.
> Order by/Sort by in subquery
> ----------------------------
>
> Key: HIVE-6348
> URL: https://issues.apache.org/jira/browse/HIVE-6348
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Rui Li
> Priority: Minor
> Labels: sub-query
> Attachments: HIVE-6348.1.patch, HIVE-6348.2.patch, HIVE-6348.3.patch,
> HIVE-6348.4.patch
>
>
> select * from (select * from foo order by c asc) bar order by c desc;
> in hive sorts the data set twice. The optimizer should probably remove any
> order by/sort by in the sub query unless you use 'limit '. Could even go so
> far as barring it at the semantic level.
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