PERF: MultiIndex.get_indexer #43370
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PERF: MultiIndex.get_indexer #43370
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jreback
approved these changes
Sep 5, 2021
| @@ -603,35 +603,34 @@ cdef class BaseMultiIndexCodesEngine: | |||
| def _codes_to_ints(self, ndarray[uint64_t] codes) -> np.ndarray: | |||
| raise NotImplementedError("Implemented by subclass") | |||
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| def _extract_level_codes(self, ndarray[object] target) -> np.ndarray: | |||
| def _extract_level_codes(self, target) -> np.ndarray: | |||
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yah mentioned in OP plans for follow-on to restore common signature/typing
| return self._codes_to_ints(np.array(level_codes, dtype='uint64').T) | ||
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| def get_indexer(self, ndarray[object] target) -> np.ndarray: | ||
| def get_indexer(self, target) -> np.ndarray: |
| def get_indexer_non_unique(self, ndarray[object] target): | ||
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| def get_indexer_non_unique(self, target): | ||
| # target: MultiIndex |
jreback
reviewed
Sep 5, 2021
| @@ -3619,7 +3619,12 @@ def _get_indexer( | |||
| elif method == "nearest": | |||
| indexer = self._get_nearest_indexer(target, limit, tolerance) | |||
| else: | |||
| indexer = self._engine.get_indexer(target._get_engine_target()) | |||
| tgt_values = target._get_engine_target() | |||
| if target._is_multi and self._is_multi: | |||
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might be worth a comment here and L5453 that this is for perf as not super obvious
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lgtm but if you can add some comments, ping on green |
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ok fair enough all of this is fine for a followon. |
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also since this is a huge speedup this migth improve some concat / join asvs for multi-multi (if so that is worth a whatsnew note0 |
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Avoids expensive construction of MultiIndex.values, followed by expensive casting of sequence-of-tuples back to tuple-of-Indexes.
Follow-up will move _extract_level_codes out of cython so that Engine._get_indexer and Engine._get_indexer_non_unique are restored to having consistent signatures.