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From "Cheng Lian (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-20246) Should check determinism when pushing predicates down through aggregation
Date Thu, 06 Apr 2017 23:13:41 GMT

    [ https://issues.apache.org/jira/browse/SPARK-20246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15959946#comment-15959946
] 

Cheng Lian commented on SPARK-20246:
------------------------------------

[This line|https://github.com/apache/spark/blob/a4491626ed8169f0162a0dfb78736c9b9e7fb434/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala#L795]
should be the root cause. We didn't check determinism of the predicates before pushing them
down.

The same thing also applies when pushing predicates through union and window operators.

cc [~cloud_fan]

> Should check determinism when pushing predicates down through aggregation
> -------------------------------------------------------------------------
>
>                 Key: SPARK-20246
>                 URL: https://issues.apache.org/jira/browse/SPARK-20246
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.1.0
>            Reporter: Weiluo Ren
>
> {code}import org.apache.spark.sql.functions._
> spark.range(1,1000).distinct.withColumn("random", rand()).filter(col("random") > 0.3).orderBy("random").show{code}
> gives wrong result.
>  In the optimized logical plan, it shows that the filter with the non-deterministic predicate
is pushed beneath the aggregate operator, which should not happen.
> cc [~lian cheng]



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