Github user zhichao-li commented on a diff in the pull request:
https://github.com/apache/spark/pull/10731#discussion_r51985561
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -322,6 +323,62 @@ class Analyzer(
}
/**
+ * Replace the index with the related attribute for order by and group
by.
+ */
+ object ResolveIndexReferences extends Rule[LogicalPlan] {
+
+ def indexToColumn(
+ sortOrder: SortOrder,
+ child: LogicalPlan,
+ index: Int,
+ direction: SortDirection): SortOrder = {
+ val orderNodes = child.output
+ if (index > 0 && index <= orderNodes.size) {
+ SortOrder(orderNodes(index - 1), direction)
+ } else {
+ throw new UnresolvedException(sortOrder,
+ s"""Order by position: $index does not exist \n
+ |The Select List is indexed from 1 to
${orderNodes.size}""".stripMargin)
+ }
+ }
+
+ def indexToColumn(
+ agg: Aggregate,
+ child: LogicalPlan,
+ index: Int): Expression = {
+ val attributes = child.output
+ if (index > 0 && index <= attributes.size) {
+ attributes(index - 1)
+ } else {
+ throw new UnresolvedException(agg,
+ s"""Aggregate by position: $index does not exist \n
+ |The Select List is indexed from 1 to
${attributes.size}""".stripMargin)
+ }
+ }
+
+ def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
+ case s @ Sort(orders, global, child) if child.resolved =>
--- End diff --
Have thought of this for a while, but still cannot come up with a concrete
solution for such nested type. Not sure if you can provide any snippet as a
suggestion?
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