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PERF: Increase threashold for using binary search in IndexEngine #54746

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merged 4 commits into from
Aug 26, 2023
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PERF: Increase threashold for using binary search in IndexEngine #54746

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0452ee3
Increase threashold for using binary search in IndexEngine
l3robot Aug 21, 2023
599d039
Add an entry to the latest whatsnew
l3robot Aug 25, 2023
156bd4f
Improve entry in the lastest whatsnew
l3robot Aug 25, 2023
c50149c
Merge branch 'main' into increase-binary-search-threshold
phofl Aug 26, 2023
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v2.2.0.rst
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Expand Up @@ -153,7 +153,7 @@ Deprecations

Performance improvements
~~~~~~~~~~~~~~~~~~~~~~~~
-
- Performance improvement when indexing with more than 4 keys (:issue:`54550`)
-

.. ---------------------------------------------------------------------------
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2 changes: 1 addition & 1 deletion pandas/_libs/index.pyx
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Expand Up @@ -375,7 +375,7 @@ cdef class IndexEngine:
# map each starget to its position in the index
if (
stargets and
len(stargets) < 5 and
len(stargets) < (n / (2 * n.bit_length())) and
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bit_lenght is just a fast way of computing the ceiling of log2.

not na_in_stargets and
self.is_monotonic_increasing
):
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