Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19229
New numbers:
numColums | Old Mean | Old Median | New Mean | New Median
-- | -- | -- | -- | --
1 | 0.17278329159999997 | 0.1537169693 | 0.16873250489999997 | 0.1521283075
10 | 0.3250422628 | 0.3086496881 | 0.16972776130000003 | 0.16117073769999998
100 | 6.3575860038 | 7.155657411799998 | 0.3299611978 | 0.3731574154
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