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