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From "Alex Behm (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] IMPALA-4055: Speed up to date() with custom implementation.
Date Wed, 25 Jan 2017 07:12:54 GMT
Alex Behm has uploaded a new patch set (#2).

Change subject: IMPALA-4055: Speed up to_date() with custom implementation.
......................................................................

IMPALA-4055: Speed up to_date() with custom implementation.

Simple implementation of to_date() that avoids calling
into boost for a speedup of 10x.

Perf:
I generated a synthetic Parquet table with 26437248 rows
and a single timestamp column. I tested the response time
of the following query before and after this change.

set mt_dop=1;
select count(*) from to_date_test
where to_date(ts) = '2017-10-23';

Before: 38.1s
After:   3.3s

Testing: I locally ran expr-test.cc and expr_test.py.

Change-Id: I5713b3e0c27b739aae597a6911cf3b2ddd01f822
---
M be/src/exprs/timestamp-functions-ir.cc
M be/src/exprs/timestamp-functions.cc
M be/src/exprs/timestamp-functions.h
3 files changed, 29 insertions(+), 12 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/91/5791/2
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I5713b3e0c27b739aae597a6911cf3b2ddd01f822
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Alex Behm <alex.behm@cloudera.com>

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