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BUG: Fix memory access violations in is_lexsorted #18005

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Merged
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Oct 28, 2017
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BUG: Fix memory access violations in is_lexsorted #18005

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9ff3450
BUG: Fix memory access violations in is_lexsorted
cgohlke Oct 27, 2017
a2e566c
TST: Use correct array dtype for libalgos.is_lexsorted
cgohlke Oct 27, 2017
8335ea8
Use assert
cgohlke Oct 28, 2017
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5 changes: 3 additions & 2 deletions pandas/_libs/algos.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -87,7 +87,7 @@ class NegInfinity(object):
@cython.boundscheck(False)
def is_lexsorted(list list_of_arrays):
cdef:
int i
Py_ssize_t i
Py_ssize_t n, nlevels
int64_t k, cur, pre
ndarray arr
Expand All @@ -99,11 +99,12 @@ def is_lexsorted(list list_of_arrays):
cdef int64_t **vecs = <int64_t**> malloc(nlevels * sizeof(int64_t*))
for i in range(nlevels):
arr = list_of_arrays[i]
assert arr.dtype.name == 'int64'
vecs[i] = <int64_t*> arr.data

# Assume uniqueness??
with nogil:
for i in range(n):
for i in range(1, n):
for k in range(nlevels):
cur = vecs[k][i]
pre = vecs[k][i -1]
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4 changes: 2 additions & 2 deletions pandas/tests/test_algos.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1219,7 +1219,7 @@ def test_is_lexsorted():
1, 1, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0]),
0, 0, 0, 0, 0, 0, 0, 0, 0], dtype='int64'),
np.array([30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16,
15, 14,
13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 30, 29, 28,
Expand All @@ -1231,7 +1231,7 @@ def test_is_lexsorted():
7, 6, 5, 4, 3, 2, 1, 0, 30, 29, 28, 27, 26, 25, 24, 23, 22,
21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7,
6, 5,
4, 3, 2, 1, 0])]
4, 3, 2, 1, 0], dtype='int64')]

assert (not libalgos.is_lexsorted(failure))

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