GitHub user michalsenkyr opened a pull request:
https://github.com/apache/spark/pull/16541
[SPARK-19088][SQL] Optimize sequence type deserialization codegen
## What changes were proposed in this pull request?
Optimization of arbitrary Scala sequence deserialization introduced by
#16240.
The previous implementation constructed an array which was then converted
by `to`. This required two passes in most cases.
This implementation attempts to remedy that by using `Builder`s provided by
the `newBuilder` method on every Scala collection's companion object to build
the resulting collection directly.
## How was this patch tested?
```bash
./build/mvn -DskipTests clean package && ./dev/run-tests
```
Additionally in Spark Shell:
```scala
case class QueueClass(q: scala.collection.immutable.Queue[Int])
spark.createDataset(Seq(List(1,2,3))).map(x =>
QueueClass(scala.collection.immutable.Queue(x: _*))).map(_.q.dequeue).collect
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/michalsenkyr/spark dataset-seq-builder
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16541.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 #16541
----
commit 4aaef15844848e16dc68d4be4d0a013c8ddcd7d7
Author: Michal Senkyr <mike.sen...@gmail.com>
Date: 2017-01-10T23:00:34Z
Rewrote sequence deserialization implementation to use builders
----
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
