uros-b commented on code in PR #58119:
URL: https://github.com/apache/spark/pull/58119#discussion_r3865189605
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteWithExpression.scala:
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@@ -66,6 +66,34 @@ object RewriteWithExpression extends Rule[LogicalPlan] {
}
}
+ /**
+ * Rewrites the `With` expressions in a single expression tree by inlining
their common
+ * expressions. Uses `transformUp` to handle nested `With`. Inlining
duplicates a definition at
+ * every reference, so this rejects non-foldable definitions: inlining one
referenced more than
+ * once would evaluate it more than once, breaking `With`'s evaluate-once
contract.
+ *
+ * Does not descend into subquery plans (e.g. `ScalarSubquery`). A caller
whose expression
+ * may contain a subquery must rewrite those plans separately.
+ */
+ def applyForExpression(expression: Expression): Expression =
Review Comment:
Can this be private[sql]?
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