Github user wzhfy commented on the issue: https://github.com/apache/spark/pull/15544 @rxin @hvanhovell @cloud-fan Do you think this is a useful aggregate function? It used to compute ndv for bins in a histogram, but we are not using histogram for now. It still can be used to compute ndv for a sequence of intervals. If you think it's useful, I'll update it, otherwise I'll close it. Thanks.
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