Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/17630
@rxin Yes, ideally that is better. But the literals in filter conditions
are in internal format, we need to do conversion work between them (internal
format) and min/max values (external format). If the internal format is
changed, we still can't keep the current implementation unchanged. I mean the
conversion logic is always there, either we do it in estimation, or in
ColumnStat. I think the later is better.
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