Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/7593#discussion_r35796020
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -947,6 +948,63 @@ class Analyzer(
Project(p.output, newPlan.withNewChildren(newChild :: Nil))
}
}
+
+ /**
+ * Removes all still-need-evaluate ordering expressions from sort and
use an inner project to
+ * materialize them, finally use a outer project to project them away to
keep the result same.
+ * Then we can make sure we only sort by [[AttributeReference]]s.
+ *
+ * As an example,
+ * {{{
+ * Sort('a, 'b + 1,
+ * Relation('a, 'b))
+ * }}}
+ * will be turned into:
+ * {{{
+ * Project('a, 'b,
+ * Sort('a, '_sortCondition,
+ * Project('a, 'b, ('b + 1).as("_sortCondition"),
+ * Relation('a, 'b))))
+ * }}}
+ */
+ object RemoveEvaluationFromSort extends Rule[LogicalPlan] {
--- End diff --
And you even made it a condition of `resolved` :) !
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