Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/11815#discussion_r56784850
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -618,13 +622,36 @@ class Analyzer(
* clause. This rule detects such queries and adds the required
attributes to the original
* projection, so that they will be available during sorting. Another
projection is added to
* remove these attributes after sorting.
+ *
+ * This rule also resolves the position number in sort references. This
support is introduced
+ * in Spark 2.0. Before Spark 2.0, the integers in Order By has no
effect on output sorting.
+ * - When the sort references are not integer but foldable expressions,
ignore them.
+ * - When spark.sql.orderByOrdinal is set to false, ignore the position
numbers too.
*/
object ResolveSortReferences extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
+ case s: Sort if !s.child.resolved => s
+ // Replace the index with the related attribute for ORDER BY
+ // which is a 1-base position of the projection list.
+ case s @ Sort(orders, global, child)
+ if conf.orderByOrdinal && orders.exists(o =>
IntegerIndex.unapply(o.child).nonEmpty) =>
+ val newOrders = orders map {
+ case s @ SortOrder(IntegerIndex(index), direction) =>
+ if (index > 0 && index <= child.output.size) {
+ SortOrder(child.output(index - 1), direction)
+ } else {
+ throw new UnresolvedException(s,
+ "Order/sort By position: $index does not exist " +
--- End diff --
seems you miss a `s` at head? Should be `s"... $index..."`
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