[jira] [Created] (IMPALA-11854) ImpalaStringWritable's underlying array can't be changed in UDFs

["Peter Rozsa (Jira)" <ji...@apache.org>]

Peter Rozsa created IMPALA-11854:
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             Summary: ImpalaStringWritable's underlying array can't be changed in UDFs
                 Key: IMPALA-11854
                 URL: https://issues.apache.org/jira/browse/IMPALA-11854
             Project: IMPALA
          Issue Type: Bug
          Components: Frontend
    Affects Versions: Impala 4.3.0
            Reporter: Peter Rozsa


ImpalaStringWritable's getBytes() implementation returns the copy of the underlying buffer, therefore the original value can't be changed. This behavior makes UDFs work erroneously when they contain operations that would change the BINARY/TEXT arguments. For example: 

[https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/udf/esri/ST_SetSRID.java#L47]

where the incoming `geomref` argument should change, but it gets returned unchanged.



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