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Update agg primitives to use more efficient functions #215
This pull request refactors various aggregation primitives to use more efficient functions for aggregation.
In many cases, we were using the nan handling version of numpy functions, but that is not not needed when applying to Pandas Series.
In other case, we were defining functions in python when we could use other performance optimized variants.
@@ Coverage Diff @@ ## master #215 +/- ## ========================================== + Coverage 93.61% 93.63% +0.01% ========================================== Files 71 71 Lines 7766 7679 -87 ========================================== - Hits 7270 7190 -80 + Misses 496 489 -7