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From "Tim Armstrong (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] IMPALA-5307: part 1: don't transfer disk I/O buffers out of parquet
Date Wed, 18 Oct 2017 19:12:22 GMT
Tim Armstrong has posted comments on this change. ( http://gerrit.cloudera.org:8080/8085 )

Change subject: IMPALA-5307: part 1: don't transfer disk I/O buffers out of parquet
......................................................................


Patch Set 10:

Mostafa, we spoke offline about this but just wanted to confirm it looked ok to you. The summary
is that the CPU cost of value materialisation for non-dict-encoded strings in uncompressed
parquet scans regresses to roughly the same CPU cost as snappy-compressed parquet. I didn't
see any regressions on TPC-H, only narrowly targeted benchmarks.


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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I767c1e2dabde7d5bd7a4d5c1ec6d14801b8260d2
Gerrit-Change-Number: 8085
Gerrit-PatchSet: 10
Gerrit-Owner: Tim Armstrong <tarmstrong@cloudera.com>
Gerrit-Reviewer: Alex Behm <alex.behm@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dhecht@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv@cloudera.com>
Gerrit-Reviewer: Mostafa Mokhtar <mmokhtar@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstrong@cloudera.com>
Gerrit-Comment-Date: Wed, 18 Oct 2017 19:12:22 +0000
Gerrit-HasComments: No

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