Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/14397#discussion_r74210475
--- 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 --
`relations` is a map. The iteration sequence of a map does not need the be
the ordered in which elements were added (Use a map larger than 4 to see this
in action, e.g.: `Seq.tabulate(5)(i => ('a' + i).toChar.toString -> i).toMap`).
So I think we need to change the data type in With to accommodate this.
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