cloud-fan commented on a change in pull request #23036: [SPARK-26065][SQL]
Change query hint from a `LogicalPlan` to a field
URL: https://github.com/apache/spark/pull/23036#discussion_r242574123
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala
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@@ -40,23 +40,33 @@ object CostBasedJoinReorder extends Rule[LogicalPlan] with
PredicateHelper {
if (!conf.cboEnabled || !conf.joinReorderEnabled) {
plan
} else {
+ // Use a map to track the hints on the join items. If a join relation
turns out unchanged
Review comment:
how to define "unchanged"? If `(a join b) join c` becomes `(b join a) join
c`, is there any hit we want to retain?
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