xy720 commented on code in PR #66981:
URL: https://github.com/apache/doris/pull/66981#discussion_r3820027810
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/CTEInline.java:
##########
@@ -135,4 +139,36 @@ private boolean
containsNondeterministicFunction(LogicalCTEProducer<?> producer)
producer.accept(NondeterministicFunctionCollector.INSTANCE,
nondeterministicFunctions);
return !nondeterministicFunctions.isEmpty();
}
+
+ /**
+ * Return true if the CTE producer's subtree is a LogicalOneRowRelation
and its
+ * final output slots are all compile-time constants.
+ */
+ private static boolean isConstantOneRowProducer(Plan producerRoot) {
+ if (!(producerRoot instanceof LogicalCTEProducer)) {
+ return false;
+ }
+ Plan node = ((LogicalCTEProducer<?>) producerRoot).child();
+ while (node instanceof LogicalSubQueryAlias) {
+ if (node.arity() != 1) {
+ return false;
+ }
+ node = node.child(0);
+ }
+ if (node instanceof LogicalProject) {
+ LogicalProject<?> project = (LogicalProject<?>) node;
+ if (project.arity() != 1) {
+ return false;
+ }
+ if (!ExpressionUtils.allMatch(project.getProjects(),
Expression::isConstant)) {
Review Comment:
Profile:
PhysicalCTEProducer[11232] ( stats=1, cteId=CTEId#1 )
+--PhysicalOneRowRelation[11227]@0 ( expressions=['2026-01-01' AS
day_start#15, ...] )
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