You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@arrow.apache.org by "Ilya Tokar (JIRA)" <ji...@apache.org> on 2019/02/07 21:14:00 UTC

[jira] [Created] (ARROW-4501) [C++] Unique returns non-unique strings

Ilya Tokar created ARROW-4501:
---------------------------------

             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.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)