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https://issues.apache.org/jira/browse/SPARK-34792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17304654#comment-17304654
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kondziolka9ld commented on SPARK-34792:
---------------------------------------
[~dongjoon]
> This doesn't look like a bug.
It is why I submitted question, not a bug.
> Not only Spark's code, but also there is difference between Scala 2.11 and
> Scala 2.12.
Not exactly, there was no such difference between spark-2-3-2-scala-2-11 and
spark-2-4-7-scala-2-12.
> BTW, please send your question to d...@spark.apache.org next time.
Done
> Restore previous behaviour of randomSplit from spark-2.4.7 in spark-3
> ---------------------------------------------------------------------
>
> Key: SPARK-34792
> URL: https://issues.apache.org/jira/browse/SPARK-34792
> Project: Spark
> Issue Type: Question
> Components: Spark Core, SQL
> Affects Versions: 3.0.1
> Reporter: kondziolka9ld
> Priority: Major
>
> Hi,
> Please consider a following difference of `randomSplit` method even despite
> of the same seed.
>
> {code:java}
> ____ __
> / __/__ ___ _____/ /__
> _\ \/ _ \/ _ `/ __/ '_/
> /___/ .__/\_,_/_/ /_/\_\ version 2.4.7
> /_/
>
> Using Scala version 2.12.10 (OpenJDK 64-Bit Server VM, Java 1.8.0_282)
> Type in expressions to have them evaluated.
> Type :help for more information.
> scala> val Array(f, s) =
> Seq(1,2,3,4,5,6,7,8,9,10).toDF.randomSplit(Array(0.3, 0.7), 42)
> f: org.apache.spark.sql.Dataset[org.apache.spark.sql.Row] = [value: int]
> s: org.apache.spark.sql.Dataset[org.apache.spark.sql.Row] = [value: int]
> scala> f.show
> +-----+
> |value|
> +-----+
> | 4|
> +-----+
> scala> s.show
> +-----+
> |value|
> +-----+
> | 1|
> | 2|
> | 3|
> | 5|
> | 6|
> | 7|
> | 8|
> | 9|
> | 10|
> +-----+
> {code}
> while as on spark-3
> {code:java}
> scala> val Array(f, s) =
> Seq(1,2,3,4,5,6,7,8,9,10).toDF.randomSplit(Array(0.3, 0.7), 42)
> f: org.apache.spark.sql.Dataset[org.apache.spark.sql.Row] = [value: int]
> s: org.apache.spark.sql.Dataset[org.apache.spark.sql.Row] = [value: int]
> scala> f.show
> +-----+
> |value|
> +-----+
> | 5|
> | 10|
> +-----+
> scala> s.show
> +-----+
> |value|
> +-----+
> | 1|
> | 2|
> | 3|
> | 4|
> | 6|
> | 7|
> | 8|
> | 9|
> +-----+
> {code}
> I guess that implementation of `sample` method changed.
> Is it possible to restore previous behaviour?
> Thanks in advance!
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