Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/10731#discussion_r50063958
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -445,6 +445,26 @@ class Analyzer(
val newOrdering = resolveSortOrders(ordering, child, throws =
false)
Sort(newOrdering, global, child)
+ // Resolve the order index to be a specific column
+ case s @ Sort(ordering, global, child) if child.resolved &&
s.resolved =>
+ def indexToColumn(index: Int, direction: SortDirection) = {
+ val orderNodes = child.output
+ if (index > 0 && index <= orderNodes.size) {
+ SortOrder(orderNodes(index - 1), direction)
+ } else {
+ throw new UnresolvedException(s,
+ s"""Order by position: $index does not exist \n
+ |The Select List is indexed from 1 to
${orderNodes.size}""".stripMargin)
+ }
+ }
+ val newOrdering = ordering map {
--- End diff --
If there are nested attributes, integer literal could be used to reference
nested fields, so we the integer literal should be on top level of order list.
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