Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20345#discussion_r175971439
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
---
@@ -141,14 +141,16 @@ object ExtractEquiJoinKeys extends Logging with
PredicateHelper {
}
/**
- * A pattern that collects the filter and inner joins.
+ * A pattern that collects the filter and inner joins (and skip
projections in plan sub-trees).
--- End diff --
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