Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/11235#discussion_r55247463 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -144,6 +146,56 @@ object EliminateSerialization extends Rule[LogicalPlan] { } /** + * Add Filter to left and right of an inner Join to filter out rows with null keys. + * So we may not need to check nullability of keys while joining. Besides, by filtering + * out keys with null, we can also reduce data size in Join. + */ +object AddFilterOfNullForInnerJoin extends Rule[LogicalPlan] with PredicateHelper { --- End diff -- Not commenting at the name at all (haven't looked at the rest of the pr), but AddFilterOfNullForEquiJoin can be shortened slightly to AddNullFilterForEquiJoin
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