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From "Alex Behm (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-4270: Gracefully fail unsupported queries with mt dop > 0.
Date Tue, 11 Oct 2016 23:49:14 GMT
Alex Behm has posted comments on this change.

Change subject: IMPALA-4270: Gracefully fail unsupported queries with mt_dop > 0.

Patch Set 1:

File testdata/workloads/functional-planner/queries/PlannerTest/mt-dop-validation.test:

Line 5: ---- PLAN
> do we need this section? or isn't this already validated somewhere else?
The purpose is to validate that this plan is executable with mt_dop>0 and num_nodes=1.
I don't think we test that elsewhere.

> we don't need this section

Line 121: select row_number() over(partition by int_col order by id)
> have you tried to run this?
I tried several values of mt_dop and this query worked fine.

Line 156: from tpch_nested_parquet.customer c, c.c_orders o, o.o_lineitems
> have you tried this?
I tried this and other similar queries. Works fine with mt_dop=2 but crashes with higher values.
Looks like a bug.

Should't this query be runnable with mt_dop>0?

Btw, compute stats fails with mt_dop=2, so it looks like there are still some issues.

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Gerrit-MessageType: comment
Gerrit-Change-Id: I91a60ea7b6e3ae4ee44be856615ddd3cd0af476d
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Alex Behm <>
Gerrit-Reviewer: Alex Behm <>
Gerrit-Reviewer: Marcel Kornacker <>
Gerrit-HasComments: Yes

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