Adam Hooper created ARROW-12670:
-----------------------------------
Summary: extract_regex gives bizarre behavior after nulls or
non-matches
Key: ARROW-12670
URL: https://issues.apache.org/jira/browse/ARROW-12670
Project: Apache Arrow
Issue Type: Bug
Components: C++, Python
Affects Versions: 4.0.0
Reporter: Adam Hooper
After a non-match, the *subsequent* string never matches.
{code}
>>> pa.compute.extract_regex(pa.array(["a", "b", "c", "d"]),
>>> pattern="(?P<x>[^b])")
<pyarrow.lib.StructArray object at 0x7f80de956640>
-- is_valid:
[
true,
false,
true,
true
]
-- child 0 type: string
[
"a",
"",
"",
"a"
]
{code}
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