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From "Marcel Kornacker (Code Review)" <ger...@cloudera.org>
Subject [Impala-CR](cdh5-trunk) Optimized ReadValueBatch() for Parquet scalar column readers.
Date Wed, 11 May 2016 07:49:20 GMT
Marcel Kornacker has posted comments on this change.

Change subject: Optimized ReadValueBatch() for Parquet scalar column readers.
......................................................................


Patch Set 5:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/2843/5/be/src/exec/hdfs-parquet-scanner.cc
File be/src/exec/hdfs-parquet-scanner.cc:

Line 1566:     valid = Get(&level);
> LGTM
actually, is this really still a concern (the extra cache line)? if you interleave def level
materialization with column value materialization, i can see why it might be an issue, but
why does it matter with batched def level materialization?


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Gerrit-MessageType: comment
Gerrit-Change-Id: I21fa9b050a45f2dd45cc0091ea5b008d3c0a3f30
Gerrit-PatchSet: 5
Gerrit-Project: Impala
Gerrit-Branch: cdh5-trunk
Gerrit-Owner: Alex Behm <alex.behm@cloudera.com>
Gerrit-Reviewer: Alex Behm <alex.behm@cloudera.com>
Gerrit-Reviewer: Marcel Kornacker <marcel@cloudera.com>
Gerrit-Reviewer: Mostafa Mokhtar <mmokhtar@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstrong@cloudera.com>
Gerrit-HasComments: Yes

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