Ilya Tokar created ARROW-4501:
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Summary: [C++] Unique returns non-unique strings
Key: ARROW-4501
URL: https://issues.apache.org/jira/browse/ARROW-4501
Project: Apache Arrow
Issue Type: Bug
Reporter: Ilya Tokar
Calling Unique on e. g. \{"some long string data","some long string
data","other data"} returns
dictionary with "some long string data" appearing twice. This is caused by off
by 1 error in DoubleCrcHash, which caused it to read 1 byte past the end of the
strings with length higher than 16, and not divisible by 4. In such cases, we
never hash p[0], and we always read one extra byte.
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