[jira] [Created] (TRAFODION-2477) Invalid characters in UCS2 to UTF8 translation are not handled correctly

["Hans Zeller (JIRA)" <ji...@apache.org>]

Hans Zeller created TRAFODION-2477:
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             Summary: Invalid characters in UCS2 to UTF8 translation are not handled correctly
                 Key: TRAFODION-2477
                 URL: https://issues.apache.org/jira/browse/TRAFODION-2477
             Project: Apache Trafodion
          Issue Type: Bug
          Components: sql-cmp
    Affects Versions: 2.0-incubating
            Reporter: Hans Zeller
            Assignee: Hans Zeller


When translating from UCS-2 to UTF-8, using CAST or TRANSLATE(... UCS2TOUTF8), all valid characters will map easily to a UTF-8 character. However, if we encounter invalid code points or invalid UTF-16 surrogate pairs, those could raise errors. Right now we just suppress those errors. Instead we should either translate them to the Unicode "replacement character" U+FFFD or we should raise an error. Ideally, we should have a CQD that decides which of these two actions to take.

Test case:

create table tbaducs2(a char(10) character set ucs2);

-- DC00 is a low-order UTF-16 surrogate, on its own this is invalid
insert into tbaducs2 values(_ucs2 X'DC000041');

select translate(a using ucs2toutf8) from tbaducs2;
-- this returns an empty string - no error, no replacement character




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