viirya commented on a change in pull request #23701: [SPARK-26741][SQL] Allow
using aggregate expressions in ORDER BY clause
URL: https://github.com/apache/spark/pull/23701#discussion_r253012398
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
##########
@@ -1666,10 +1679,12 @@ class Analyzer(
// we need to check this and prevent applying this rule multiple
times
if (sortOrder == finalSortOrders) {
sort
+ } else if (needsPushDown.isEmpty) {
+ Sort(finalSortOrders, global, child)
} else {
- Project(aggregate.output,
+ Project(child.output,
Sort(finalSortOrders, global,
- aggregate.copy(aggregateExpressions = originalAggExprs ++
needsPushDown)))
+ pushDownMissingAttrs(needsPushDown, child)))
Review comment:
oh, for now `pushDownMissingAttrs` will return `child` if it is unexpected.
For that case, we may just return original plan, instead of adding `Project`
and changing `Sort`.
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