Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/15112
The current code collects `ColumnStats` objects for every column of the
relation; those are captured in a huge `GenericInternalRow` (one per partition)
and sent back to the driver, which stores everything in a collection
accumulator. Thus the memory issue.
On the driver side, all that seems to be done is to sum up the sizes of
each column to provide a `Statistics` object, so it seems like most of the data
could be thrown away.
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