Philip Zeyliger has posted comments on this change.

Change subject: IMPALA-5908: Allow SET to unset modified query options.
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Patch Set 5:

Following through on the layering (process options, pool defaults, session 
options, and request options), there are some complexities.

When I changed SetQueryOption(option, "") to reset the mask bit, a new test 
found that server process options weren't surviving a reset cycle. What's going 
on is that SessionState.default_query_options is initialized to 
ImpalaServer.default_query_options, and that resolution is never re-applied. 
So, when we "reset", we don't handily have a reference to what to reset it to.

I'm planning to rename session->default_query_options to 
session->session_query_options, and resolve against the server defaults every 
time.

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Gerrit-MessageType: comment
Gerrit-Change-Id: Ia8c383e68064f839cb5000118901dff77b4e5cb9
Gerrit-PatchSet: 5
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Philip Zeyliger <[email protected]>
Gerrit-Reviewer: Bharath Vissapragada <[email protected]>
Gerrit-Reviewer: Dan Hecht <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins
Gerrit-Reviewer: Philip Zeyliger <[email protected]>
Gerrit-Reviewer: Tim Armstrong <[email protected]>
Gerrit-HasComments: No

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