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https://issues.apache.org/jira/browse/SPARK-32761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-32761:
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Assignee: Apache Spark
> 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: Apache Spark
> Priority: Major
>
> 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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