Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/18652#discussion_r127897096 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -1912,6 +1913,26 @@ class Analyzer( nondeterToAttr.get(e).map(_.toAttribute).getOrElse(e) }.copy(child = newChild) + case j: Join if j.condition.isDefined && !j.condition.get.deterministic => + j match { + // We can push down non-deterministic joining keys. --- End diff -- How `rand(a)` and `rand(b)` share the same state? They are different expression instances.
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