Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15363#discussion_r106773716
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/joins.scala
---
@@ -83,9 +411,19 @@ object ReorderJoin extends Rule[LogicalPlan] with
PredicateHelper {
}
def apply(plan: LogicalPlan): LogicalPlan = plan transform {
- case j @ ExtractFiltersAndInnerJoins(input, conditions)
+ case ExtractFiltersAndInnerJoins(input, conditions)
if input.size > 2 && conditions.nonEmpty =>
- createOrderedJoin(input, conditions)
+ if (conf.starSchemaDetection && !conf.cboEnabled) {
--- End diff --
I don't think this algorithm conflicts with CBO, thought it conflicts with
the other join reordering rule.
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