Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/8231#discussion_r37465181
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -463,12 +463,23 @@ class Analyzer(
// Find sort attributes that are projected away so we can
temporarily add them back in.
val (newOrdering, missingAttr) = resolveAndFindMissing(ordering,
a, groupingRelation)
+ val existingNames = aggs.map(_.name)
+ val prefix = {
+ var init = "_aggOrdering"
+ while (existingNames.exists(_.startsWith(init))) {
+ init = "_" + init
+ }
+ init
+ }
+ var i = 0
// Find aggregate expressions and evaluate them early, since they
can't be evaluated in a
// Sort.
val (withAggsRemoved, aliasedAggregateList) = newOrdering.map {
- case aggOrdering if aggOrdering.collect { case a:
AggregateExpression => a }.nonEmpty =>
- val aliased = Alias(aggOrdering.child, "_aggOrdering")()
- (aggOrdering.copy(child = aliased.toAttribute), Some(aliased))
+ case aggOrdering if
aggOrdering.find(_.isInstanceOf[AggregateExpression]).isDefined =>
+ val aliasName = prefix + i
+ i += 1
+ val aliased = Alias(aggOrdering.child, aliasName)()
+ (aggOrdering.copy(child = UnresolvedAttribute(aliasName)),
Some(aliased))
--- End diff --
Not a subclass, just another field (like `qualifiers`) that we can use to
say that a given attribute produced by an alias can't be resolved by name, but
only by explicitly calling `toAttribute` on the alias.
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