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PERF: BlockPlacement.copy() speed-up #10073

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PERF: BlockPlacement.copy() speed-up #10073

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20 changes: 14 additions & 6 deletions pandas/lib.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -1641,12 +1641,21 @@ cdef class BlockPlacement:

cdef bint _has_slice, _has_array, _is_known_slice_like

def __init__(self, val):
def __init__(self, val, fastpath=False):
cdef slice slc

self._has_slice = False
self._has_array = False

if fastpath:
if isinstance(val, slice):
self._as_slice = val
self._has_slice = True
else:
self._as_array = val
self._has_array = True
return

if isinstance(val, slice):
slc = slice_canonize(val)

Expand Down Expand Up @@ -1783,12 +1792,11 @@ cdef class BlockPlacement:

return self

cdef BlockPlacement copy(self):
cdef slice s = self._ensure_has_slice()
if s is not None:
return BlockPlacement(s)
cpdef BlockPlacement copy(self):
if self._as_slice is not None:
return BlockPlacement(self._as_slice, fastpath=True)
else:
return BlockPlacement(self._as_array)
return BlockPlacement(self._as_array, fastpath=True)

def add(self, other):
return self.copy().iadd(other)
Expand Down