Github user Serhii-Harnyk commented on the issue:
https://github.com/apache/drill/pull/594
@chunhui-shi
Results of performance test
| % of nullable records | with fix | master | %(t-t0)/t0 |
| 0.001 | 13986,77778 | 13752,11111 | 1,71% |
| 0.1 | 13873,55556 | 13081,33333 | 6,06% |
| 0.5 | 11345,55556 | 7552,444444 | 50,22% |
| 0.7 | 12699,11111 | 5753,444444 | 120,72% |
| 0.99 | 14544,22222 | 494 | 2844,17% |
So increase of performance depends on % of nullable fields in dataset
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