Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13701
> It sounds like the invalid rows will still be filtered out during column
assembly even if we are unable to prune any row group. If so, counting number
of rows does not help us determine how many row groups were pruned. Is my
understanding right?
@gatorsmile I think it depends. What we do for this filtering is to use
`RowGroupFilter.filterRowGroups`. `RowGroupFilter` only performs filtering on
row-group level.
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