Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16933#discussion_r101341238
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/dsl/package.scala ---
@@ -374,6 +374,9 @@ package object dsl {
case plan => SubqueryAlias(alias, plan, None)
}
+ def coalesce(num: Integer): LogicalPlan =
--- End diff --
They are used for the test cases in catalyst package, in which Dataset APIs
are not available. Thus, that is why we add these DSL for test cases
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