Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/15637
@rxin By "histograms" for numeric columns, do you mean equi-height
histogram? The main purpose of this pr is to construct equi-width histogram
without prior knowledge of ndv, so that we can compute it with other stats in
the same scan. And equi-width histogram is important for both string and
numeric(including timestamp and date) types, because it provides more accurate
estimation than equi-height histogram.
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