Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/10052#discussion_r46895432
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -178,6 +179,27 @@ class Analyzer(
}
}
+ /**
+ * Replaces queries of the form "SELECT expr FROM A GROUP BY 1"
+ * with a query of the form "SELECT expr FROM A GROUP BY expr"
+ */
+ object ResolveGroupByReferences extends Rule[LogicalPlan] {
+
+ def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
+ case Aggregate(groups, aggs, child) =>
+ Aggregate(groups.map(group => group match {
--- End diff --
Nit: would you mind assigning this to an intermediate variable. this is a
little hard to parse visually.
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