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[SPARK-21052][SQL][FOLLOW-UP] Add hash map metrics to join
## What changes were proposed in this pull request? Remove `numHashCollisions` in `BytesToBytesMap`. And change `getAverageProbesPerLookup()` to `getAverageProbesPerLookup` as suggested. ## How was this patch tested? Existing tests. Author: Liang-Chi Hsieh <viirya@gmail.com> Closes #18480 from viirya/SPARK-21052-followup.
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- core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java 0 additions, 33 deletions...ain/java/org/apache/spark/unsafe/map/BytesToBytesMap.java
- sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashJoin.scala 1 addition, 1 deletion...scala/org/apache/spark/sql/execution/joins/HashJoin.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala 4 additions, 4 deletions...org/apache/spark/sql/execution/joins/HashedRelation.scala
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