Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/14090
LGTM except for comment on "schema matching".
Also I wonder if we should rephrase "can only be used if the output of UDF
run on all the partitions can fit in driver memory" - it seems not as strong as
a warning or correct as "can fail if the output of UDF run on all the partition
cannot be pulled to the driver and fit in driver memory" (same in
`dapplyCollect`)
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