GitHub user nongli opened a pull request:
https://github.com/apache/spark/pull/11624
[SPARK-13790] Speed up ColumnVector's getDecimal
## What changes were proposed in this pull request?
We should reuse an object similar to the other non-primitive type getters.
For
a query that computes averages over decimal columns, this shows a 10%
speedup
on overall query times.
## How was this patch tested?
Existing tests and this benchmark
```
TPCDS Snappy: Best/Avg Time(ms) Rate(M/s) Per
Row(ns)
--------------------------------------------------------------------------------
q27-agg (master) 10627 / 11057 10.8
92.3
q27-agg (this patch) 9722 / 9832 11.8
84.4
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/nongli/spark spark-13790
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11624.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 #11624
----
commit 3b5ad124c18cf4c87620c8b20272c670acf59509
Author: Nong Li <[email protected]>
Date: 2016-03-10T01:00:13Z
[SPARK-13790] Speed up ColumnVector's getDecimal
We should reuse an object similar to the other non-primitive type getters.
For
a query that computes averages over decimal columns, this shows a 10%
speedup
on overall query times.
TPCDS Snappy: Best/Avg Time(ms) Rate(M/s) Per
Row(ns)
--------------------------------------------------------------------------------
q27-agg (master) 10627 / 11057 10.8
92.3
q27-agg (this patch) 9722 / 9832 11.8
84.4
----
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