Github user viirya commented on the issue:
https://github.com/apache/spark/pull/21312
@icexelloss It only happens when there are more than one batch in each
partition. Existing tests do not hit this condition. That is why the added test
here is doing a `repartition`:
`df = self.data.withColumn("arr", array(col("id"))).repartition(1, "id")`
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