GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/8052
[SPARK-9759] [SQL] improve decimal.times() and cast(int, decimalType)
This patch optimize two things:
1. passing MathContext to JavaBigDecimal.multiply/divide/reminder to do
right rounding, because java.math.BigDecimal.apply(MathContext) is expensive
2. Cast integer/short/byte to decimal directly (without double)
This two optimizations could speed up the end-to-end time of a aggregation
(SUM(short * decimal(5, 2)) 75% (from 19s -> 10.8s)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark optimize_decimal
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8052.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #8052
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commit 225efadaeef59b07ca9c0723a0524ff46b780fa0
Author: Davies Liu <[email protected]>
Date: 2015-08-08T21:48:17Z
improve decimal.times() and cast(int, decimalType)
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