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Posted to issues@spark.apache.org by "Wenchen Fan (Jira)" <ji...@apache.org> on 2020/10/16 03:38:00 UTC
[jira] [Updated] (SPARK-32761) Planner error when aggregating
multiple distinct Constant columns
[ https://issues.apache.org/jira/browse/SPARK-32761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wenchen Fan updated SPARK-32761:
--------------------------------
Fix Version/s: 3.0.2
> Planner error when aggregating multiple distinct Constant columns
> -----------------------------------------------------------------
>
> Key: SPARK-32761
> URL: https://issues.apache.org/jira/browse/SPARK-32761
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Linhong Liu
> Assignee: Liu, Linhong
> Priority: Major
> Fix For: 3.0.2, 3.1.0
>
>
> SELECT COUNT(DISTINCT 2), COUNT(DISTINCT 2, 3) will trigger this bug.
> The problematic code is:
>
> {code:java}
> val distinctAggGroups = aggExpressions.filter(_.isDistinct).groupBy { e =>
> val unfoldableChildren = e.aggregateFunction.children.filter(!_.foldable).toSet
> if (unfoldableChildren.nonEmpty) {
> // Only expand the unfoldable children
> unfoldableChildren
> } else {
> // If aggregateFunction's children are all foldable
> // we must expand at least one of the children (here we take the first child),
> // or If we don't, we will get the wrong result, for example:
> // count(distinct 1) will be explained to count(1) after the rewrite function.
> // Generally, the distinct aggregateFunction should not run
> // foldable TypeCheck for the first child.
> e.aggregateFunction.children.take(1).toSet
> }
> }
> {code}
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