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https://issues.apache.org/jira/browse/HIVE-12615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15052779#comment-15052779
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Nemon Lou commented on HIVE-12615:
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I didn't expect so many test case are affected. Sorry for haven't run these
test on my own .
I think it's better to mark this improvement as won't fix ,since explain is a
rare use case for most users.
> Do not start spark session when only explain
> ---------------------------------------------
>
> Key: HIVE-12615
> URL: https://issues.apache.org/jira/browse/HIVE-12615
> Project: Hive
> Issue Type: Improvement
> Components: Spark
> Affects Versions: 1.3.0, 2.1.0
> Reporter: Nemon Lou
> Assignee: Nemon Lou
> Priority: Minor
> Attachments: HIVE-12615.patch
>
>
> When using beeline -e "set hive.execution.engine=spark;explain select
> count(*) from sometable",it's very slow due to starting of spark session on
> yarn.
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