Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/15637
Oh, do you mean using count min sketch for equi-width histogram? Actually I
don't know about the sketch, I need to look into it to see if it's easy to use
as an agg function and also support float/double/decimal types. But I do think
this pr takes much less effort to implement what we want :)
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