cloud-fan commented on code in PR #58419:
URL: https://github.com/apache/spark/pull/58419#discussion_r4000525680
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sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
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@@ -2908,7 +2908,9 @@ object SQLConf {
.doc("When both this conf and `spark.sql.codegen.wholeStage` are true, "
+
"UnionExec participates in whole-stage codegen on its " +
"non-partitioning-aware path: the parent and all children fuse into " +
- "a single WholeStageCodegenExec stage.")
+ "a single WholeStageCodegenExec stage. The value is read when a
UnionExec " +
Review Comment:
Confirmed: all three configuration descriptions now say the value is fixed
during physical preparation, so a DataFrame first prepared after a change
observes the new value. Resolved.
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