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https://issues.apache.org/jira/browse/HIVE-19684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488305#comment-16488305
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slim bouguerra commented on HIVE-19684:
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added tests case.
> Hive stats optimizer wrongly uses stats against non native tables
> -----------------------------------------------------------------
>
> Key: HIVE-19684
> URL: https://issues.apache.org/jira/browse/HIVE-19684
> Project: Hive
> Issue Type: Bug
> Components: Druid integration, Physical Optimizer
> Reporter: slim bouguerra
> Assignee: slim bouguerra
> Priority: Blocker
> Fix For: 3.0.0
>
> Attachments: HIVE-19684.2.patch, HIVE-19684.patch
>
>
> Stats of non native tables are inaccurate, thus queries over non native
> tables can not optimized by stats optimizer.
> Take example of query
> {code}
> Explain select count(*) from (select `__time` from druid_test_table limit 1)
> as src ;
> {code}
> the plan will be reduced to
> {code}
> POSTHOOK: query: explain extended select count(*) from (select `__time` from
> druid_test_table limit 1) as src
> POSTHOOK: type: QUERY
> STAGE DEPENDENCIES:
> Stage-0 is a root stage
> STAGE PLANS:
> Stage: Stage-0
> Fetch Operator
> limit: 1
> Processor Tree:
> ListSink
> {code}
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