GitHub user eatoncys opened a pull request:
https://github.com/apache/spark/pull/23262
[SPARK-26312][SQL]Converting converters in RDDConversions into arrays to
improve their access performance
## What changes were proposed in this pull request?
`RDDConversions` would get disproportionately slower as the number of
columns in the query increased.
This PR converts the `converters` in `RDDConversions` into arrays to
improve their access performance, the type of `converters` before is
`scala.collection.immutable.::` which is a subtype of list.
The test of `PrunedScanSuite` for 2000 columns and 20k rows takes 409
seconds before this PR, and 361 seconds after.
## How was this patch tested?
Test case of `PrunedScanSuite`
Please review http://spark.apache.org/contributing.html before opening a
pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/eatoncys/spark toarray
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/23262.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 #23262
----
commit ddb252892a439281b16bc14fdfdb7faf756f1067
Author: 10129659 <chen.yanshan@...>
Date: 2018-12-08T07:15:10Z
Converting converters in RDDConversions into arrays to improve their access
performance
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