Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19229
numColums | RDD Mean | RDD Median | DataFrame Mean | DataFrame Median
-- | -- | -- | -- | --
1 | 0.1642173481 | 0.199774305 | 0.42601806710000006 | 0.2025112919
10 | 0.3713707549 | 0.5290104043000001 | 0.43626068409999996 |
0.49521778340000006
100 | 6.8645389335 | 8.838674982899999 | 1.6645560224 | 2.9213964243999997
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