Github user mgaido91 commented on a diff in the pull request: https://github.com/apache/spark/pull/22326#discussion_r220484279 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/joins.scala --- @@ -152,3 +153,51 @@ object EliminateOuterJoin extends Rule[LogicalPlan] with PredicateHelper { if (j.joinType == newJoinType) f else Filter(condition, j.copy(joinType = newJoinType)) } } + +/** + * Correctly handle PythonUDF which need access both side of join side by changing the new join + * type to Cross. + */ +object PullOutPythonUDFInJoinCondition extends Rule[LogicalPlan] with PredicateHelper { + def hasPythonUDF(expression: Expression): Boolean = { + expression.collectFirst { case udf: PythonUDF => udf }.isDefined + } + + override def apply(plan: LogicalPlan): LogicalPlan = plan transformUp { + case j @ Join(_, _, joinType, condition) + if condition.isDefined && hasPythonUDF(condition.get) => + if (!joinType.isInstanceOf[InnerLike] && joinType != LeftSemi) { --- End diff -- can't we support `LeftAnti` too?
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