peter-toth commented on a change in pull request #24831: [SPARK-19799][SQL]
Better support for WITH clause
URL: https://github.com/apache/spark/pull/24831#discussion_r299012034
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -212,31 +212,96 @@ class Analyzer(
)
/**
- * Analyze cte definitions and substitute child plan with analyzed cte
definitions.
+ * Analyze WITH nodes and substitute child plan with CTE definitions.
*/
object CTESubstitution extends Rule[LogicalPlan] {
- def apply(plan: LogicalPlan): LogicalPlan = plan.resolveOperatorsUp {
- case With(child, relations) =>
- // substitute CTE expressions right-to-left to resolve references to
previous CTEs:
- // with a as (select * from t), b as (select * from a) select * from b
- relations.foldRight(child) {
- case ((cteName, ctePlan), currentPlan) =>
- substituteCTE(currentPlan, cteName, ctePlan)
- }
- case other => other
- }
+ def apply(plan: LogicalPlan): LogicalPlan = traverse(plan, false)
Review comment:
Thanks @maropu for the review! I changed as you suggested.
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