[SPARK-32800][SQL] Remove ExpressionSet from the 2.13 branch

### What changes were proposed in this pull request? This PR is a followup on #29598 and removes the `ExpressionSet` class from the 2.13 branch. ### Why are the changes needed? `ExpressionSet` does not extend Scala `Set` anymore and this class is no longer needed in the 2.13 branch. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Passes existing tests Closes #29648 from dbaliafroozeh/RemoveExpressionSetFrom2.13Branch. Authored-by: Ali Afroozeh <ali.afroozeh@databricks.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org>
apache · Sep 6, 2020 · f556946 · f556946
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diff --git a/...atalyst/src/main/scala-2.13/org/apache/spark/sql/catalyst/expressions/ExpressionSet.scala b/...atalyst/src/main/scala-2.13/org/apache/spark/sql/catalyst/expressions/ExpressionSet.scala
diff --git a/.../catalyst/expressions/ExpressionSet.scala → .../catalyst/expressions/ExpressionSet.scala b/.../catalyst/expressions/ExpressionSet.scala → .../catalyst/expressions/ExpressionSet.scala