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From "Tim Armstrong (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] Add doc for MT DOP query option.
Date Wed, 18 Jan 2017 22:51:03 GMT
Tim Armstrong has posted comments on this change.

Change subject: Add doc for MT_DOP query option.
......................................................................


Patch Set 1:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/5652/1/docs/topics/impala_mt_dop.xml
File docs/topics/impala_mt_dop.xml:

Line 43:     </p>
I think it would make sense to document (for now) that many queries don't support mt_dop,
so that users aren't surprised to get an error after setting it. E.g. 

[localhost:21000] > set mt_dop=1;
MT_DOP set to 1
[localhost:21000] > select * from functional.alltypes a1 inner join functional.alltypes
a2 on a1.id = a2.id limit 4;
Query: select * from functional.alltypes a1 inner join functional.alltypes a2 on a1.id = a2.id
limit 4
Query submitted at: 2017-01-18 14:49:46 (Coordinator: http://tarmstrong-box:25000)
ERROR: NotImplementedException: MT_DOP not supported for plans with base table joins or table
sinks.


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Gerrit-MessageType: comment
Gerrit-Change-Id: Ife2786532b425af6d230074f1c0b5c7dcb2b8a92
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: John Russell <jrussell@cloudera.com>
Gerrit-Reviewer: Alex Behm <alex.behm@cloudera.com>
Gerrit-Reviewer: Mostafa Mokhtar <mmokhtar@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstrong@cloudera.com>
Gerrit-HasComments: Yes

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