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From "Alex Behm (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-5036: Parquet count star optimization
Date Fri, 16 Jun 2017 05:15:42 GMT
Alex Behm has posted comments on this change.

Change subject: IMPALA-5036: Parquet count star optimization

Patch Set 5: Code-Review+1


Final nits. I'm happy with this patch. Dan should give the final +2
File testdata/workloads/functional-query/queries/QueryTest/parquet-stats-agg.test:

Line 86: # Verify that 0 is returned when we are selecting from an empty table and the optimization
I think it's sufficient to say:

Verify that 0 is returned for count(*) on an empty table.
File tests/query_test/

Line 275:     if (vector.get_value('table_format').file_format != 'text' or
> if we set it to parquet then this test will not run as part of core at all.
Good point. Ok to leave.

Line 280:     vector.get_value('exec_option')['batch_size'] = 1
> No, I checked, batch size does not vary for this test in exhaustive
The core tests we run and the dimensions we use seem somewhat broken/scary to me. Can you
file a JIRA to reconsider the current choices in this test? I feel like we should run Parquet
in core and we should run with different batch sizes in exhaustive. But let's not do that

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Gerrit-MessageType: comment
Gerrit-Change-Id: I536b85c014821296aed68a0c68faadae96005e62
Gerrit-PatchSet: 5
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Taras Bobrovytsky <>
Gerrit-Reviewer: Alex Behm <>
Gerrit-Reviewer: Dan Hecht <>
Gerrit-Reviewer: Lars Volker <>
Gerrit-Reviewer: Marcel Kornacker <>
Gerrit-Reviewer: Mostafa Mokhtar <>
Gerrit-Reviewer: Taras Bobrovytsky <>
Gerrit-Reviewer: Zach Amsden <>
Gerrit-HasComments: Yes

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