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[SPARK-13598] [SQL] remove LeftSemiJoinBNL
## What changes were proposed in this pull request? Broadcast left semi join without joining keys is already supported in BroadcastNestedLoopJoin, it has the same implementation as LeftSemiJoinBNL, we should remove that. ## How was this patch tested? Updated unit tests. Author: Davies Liu <davies@databricks.com> Closes #11448 from davies/remove_bnl.
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sql/core/src/main/scala/org/apache/spark/sql/execution/joins/LeftSemiJoinBNL.scala
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