Github user tejasapatil commented on the issue: https://github.com/apache/spark/pull/15575 @rxin : Yes. There was a comment over there [0] but based on code it does not look like its moving rows across input partitions (cc @chenghao-intel who added that). [0] : https://github.com/facebook/FB-Spark/blob/d26c42982c18da8fb1b21c9eb75aef9364d1b992/sql/core/src/main/scala/org/apache/spark/sql/execution/Expand.scala#L45
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