Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/11208#discussion_r53890012
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -350,28 +351,83 @@ class Analyzer(
}
/**
- * Replaces [[UnresolvedAttribute]]s with concrete
[[AttributeReference]]s from
- * a logical plan node's children.
+ * Expand [[UnresolvedStar]] or [[ResolvedStar]] to the matching
attributes in child's output.
*/
- object ResolveReferences extends Rule[LogicalPlan] {
+ object ResolveStar extends Rule[LogicalPlan] {
+
+ def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
+ case p: LogicalPlan if !p.childrenResolved => p
+
+ // If the projection list contains Stars, expand it.
+ case p: Project if containsStar(p.projectList) =>
+ val expanded = p.projectList.flatMap {
+ case s: Star => s.expand(p.child, resolver)
+ case ua @ UnresolvedAlias(_: UnresolvedFunction | _: CreateArray
| _: CreateStruct, _) =>
+ UnresolvedAlias(child = expandStarExpression(ua.child,
p.child)) :: Nil
+ case a @ Alias(_: UnresolvedFunction | _: CreateArray | _:
CreateStruct, _) =>
+ Alias(child = expandStarExpression(a.child, p.child), a.name)(
+ isGenerated = a.isGenerated) :: Nil
+ case o => o :: Nil
+ }
+ Project(projectList = expanded, p.child)
+ // If the aggregate function argument contains Stars, expand it.
+ case a: Aggregate if containsStar(a.aggregateExpressions) =>
+ val expanded = a.aggregateExpressions.flatMap {
+ case s: Star => s.expand(a.child, resolver)
+ case o if containsStar(o :: Nil) => expandStarExpression(o,
a.child) :: Nil
+ case o => o :: Nil
+ }.map(_.asInstanceOf[NamedExpression])
+ a.copy(aggregateExpressions = expanded)
+ // If the script transformation input contains Stars, expand it.
+ case t: ScriptTransformation if containsStar(t.input) =>
+ t.copy(
+ input = t.input.flatMap {
+ case s: Star => s.expand(t.child, resolver)
+ case o => o :: Nil
+ }
+ )
+ case g: Generate if containsStar(g.generator.children) =>
+ failAnalysis("Cannot explode *, explode can only be applied on a
specific column.")
--- End diff --
do we have a test for this error message?
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