Karen Coppage commented on HIVE-17268:

[~pvary] Thanks very much for your input! That makes a lot of sense, and I made 
appropriate fixes.

One clarification: The HiveConf accessible by the jamon file matches the 
original configuration; however, if hive.log.explain.output is originally set 
to true, it can be turned off and back on again on a per session basis (which 
might not be so bad). If it is initially set to false, then turned on within 
the session, it should be viewable somewhere in the logs/output, just never on 
the WebUI. So the user does have some freedom in this respect.

> WebUI / QueryPlan: query plan is sometimes null when explain output conf is on
> ------------------------------------------------------------------------------
>                 Key: HIVE-17268
>                 URL: https://issues.apache.org/jira/browse/HIVE-17268
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Karen Coppage
>            Assignee: Karen Coppage
>            Priority: Minor
>         Attachments: HIVE-17268.patch
> The Hive WebUI's Query Plan tab displays "SET hive.log.explain.output TO true 
> TO VIEW PLAN" even when hive.log.explain.output is set to true, when the 
> query cannot be compiled, because the plan is null in this case.

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