Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14397#discussion_r74211126
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -125,21 +125,23 @@ class Analyzer(
object CTESubstitution extends Rule[LogicalPlan] {
// TODO allow subquery to define CTE
def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
- case With(child, relations) => substituteCTE(child, relations)
+ case With(child, relations) if relations.nonEmpty =>
--- End diff --
So, I changed it to `Seq`. Now, `relations` of `With` is a sequence.
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