[
https://issues.apache.org/jira/browse/HIVE-10238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14682061#comment-14682061
]
Teddy Choi commented on HIVE-10238:
-----------------------------------
Dear [~chengxiang li]. My benchmark results shows the bitwise operator
optimization makes {{IfExprLongColumnLongColumn}} 44% faster. I still need to
clean code for {{IfExprDoubleColumnDoubleColumn}}. I will make a patch file
later. Thanks.
Main difference:
{code}
outputVector[i] = (~(vector1[i] - 1) & vector2[i]) | ((vector1[i] - 1) &
vector3[i]);
{code}
Performance before patch:
{noformat}
o.a.h.b.v.VectorizationBench.IfExprLongColumnLongColumnBench.bench
avgt 2 2957210719.500 ± NaN ns/op
{noformat}
Performance after patch:
{noformat}
o.a.h.b.v.VectorizationBench.IfExprLongColumnLongColumnBench.bench
avgt 2 2048923771.000 ± NaN ns/op
{noformat}
> Loop optimization for SIMD in IfExprColumnColumn.txt
> ----------------------------------------------------
>
> Key: HIVE-10238
> URL: https://issues.apache.org/jira/browse/HIVE-10238
> Project: Hive
> Issue Type: Sub-task
> Components: Vectorization
> Affects Versions: 1.1.0
> Reporter: Chengxiang Li
> Assignee: Chengxiang Li
> Priority: Minor
>
> The ?: operator as following could not be vectorized in loop, we may transfer
> it into mathematical expression.
> {code:java}
> for(int j = 0; j != n; j++) {
> int i = sel[j];
> outputVector[i] = (vector1[i] == 1 ? vector2[i] : vector3[i]);
> outputIsNull[i] = (vector1[i] == 1 ?
> arg2ColVector.isNull[i] : arg3ColVector.isNull[i]);
> }
> {code}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
