GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/17559
[SPARK-20246][SQL] Don't pushdown non-deterministic expression through
Aggregate
## What changes were proposed in this pull request?
import org.apache.spark.sql.functions._
val df = spark.range(1,1000).distinct.withColumn("random",
rand()).filter(col("random") > 0.3).orderBy("random")
The optimized plan before this:
Sort [random#4 ASC NULLS FIRST], true
+- Aggregate [id#0L], [id#0L, rand(-3812200341668550973) AS random#4]
+- Filter (rand(-3812200341668550973) > 0.3)
+- Range (1, 1000, step=1, splits=Some(2))
The optimized plan after this:
Sort [random#4 ASC NULLS FIRST], true
+- Filter (random#4 > 0.3)
+- Aggregate [id#0L], [id#0L, rand(-6229677203478213930) AS random#4]
+- Range (1, 1000, step=1, splits=Some(2))
## How was this patch tested?
Will add test later.
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/viirya/spark-1
dont-pushdown-nondeter-expr-through-agg
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17559.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 #17559
----
commit 77896e94c854f94802d33131dc552ecb923e73ad
Author: Liang-Chi Hsieh <vii...@gmail.com>
Date: 2017-04-07T05:54:35Z
Don't pushdown non-deterministic expression through Aggregate.
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