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CLN: Adding comment/more info about a possible alternative approach to murmur2-hash #37876

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Merged
jreback merged 1 commit into from
Nov 15, 2020
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CLN: Adding comment/more info about a possible alternative approach to murmur2-hash #37876

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5 changes: 5 additions & 0 deletions pandas/_libs/src/klib/khash_python.h
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Expand Up @@ -16,6 +16,11 @@
// GH 13436 showed that _Py_HashDouble doesn't work well with khash
// GH 28303 showed, that the simple xoring-version isn't good enough
// See GH 36729 for evaluation of the currently used murmur2-hash version
// An interesting alternative to expensive murmur2-hash would be to change
// the probing strategy and use e.g. the probing strategy from CPython's
// implementation of dicts, which shines for smaller sizes but is more
// predisposed to superlinear running times (see GH 36729 for comparison)


khint64_t PANDAS_INLINE asint64(double key) {
khint64_t val;
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