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https://issues.apache.org/jira/browse/HIVE-18163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16270631#comment-16270631
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Zoltan Haindrich commented on HIVE-18163:
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I think the following usecase was not supported before; and it wont be
supported after this patch either:
* user1 opens a session on HS2 instance#1 ; MV cache loads
* user2 opens a session on HS2 instance#2
* user2 creates a materialized view
* user1's session is not aware of the new view; I think there is no way to
reload the MV cache.... so the only option would be to restart the HS2
> Stats: create materialized view should also collect stats
> ---------------------------------------------------------
>
> Key: HIVE-18163
> URL: https://issues.apache.org/jira/browse/HIVE-18163
> Project: Hive
> Issue Type: Sub-task
> Components: Statistics
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Attachments: HIVE-18163.01.patch
>
>
> not having basic stats on the materialized view may cause it to be "ruled
> out" as a viable alternative by the cbo.
> repro set {{set hive.stats.deserialization.factor=10.0}} in
> {{ql/src/test/queries/clientpositive/materialized_view_create_rewrite.q}}
> blocks: HIVE-18149
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