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Date: Wed, 18 Jan 2017 22:51:03 +0000
From: "Tim Armstrong (Code Review)"
To: John Russell , impala-cr@cloudera.com,
reviews@impala.incubator.apache.org
CC: Alex Behm ,
Mostafa Mokhtar
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Subject: =?UTF-8?Q?=5BImpala-ASF-CR=5D_Add_doc_for_MT_DOP_query_option=2E=0A?=
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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:
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-Change-Id: Ife2786532b425af6d230074f1c0b5c7dcb2b8a92
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Gerrit-Project: Impala-ASF
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Gerrit-Owner: John Russell
Gerrit-Reviewer: Alex Behm
Gerrit-Reviewer: Mostafa Mokhtar
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