Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/10052#discussion_r48045669
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -178,6 +179,46 @@ class Analyzer(
}
}
+ /**
+ * Replaces queries of the form "SELECT expr FROM A GROUP BY 1 ORDER BY
1"
+ * with a query of the form "SELECT expr FROM A GROUP BY expr ORDER BY
expr"
+ */
+ object ResolveNumericReferences extends Rule[LogicalPlan] {
+
+ def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
+ case Aggregate(groups, aggs, child) =>
+ val newGroups = groups.map {
+ case group if group.isInstanceOf[Literal] &&
group.dataType.isInstanceOf[IntegralType] =>
+ aggs(group.toString.toInt - 1) match {
+ case u: UnresolvedAlias =>
+ u.child match {
+ case UnresolvedStar(_) => // Can't replace literal with
column yet
+ group
+ case _ => u.child
+ }
+ case a: Alias => a.child
+ case a: AttributeReference => a
+ }
+ case group => group
+ }
+ Aggregate(newGroups, aggs, child)
+ case Sort(ordering, global, child) =>
+ val newOrdering = ordering.map {
+ case o if o.child.isInstanceOf[Literal] &&
o.dataType.isInstanceOf[IntegralType] =>
--- End diff --
Same comment as above.
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