hongbin ma created KYLIN-2031:

             Summary: some more DimensionEncoding
                 Key: KYLIN-2031
                 URL: https://issues.apache.org/jira/browse/KYLIN-2031
             Project: Kylin
          Issue Type: New Feature
            Reporter: hongbin ma
            Assignee: hongbin ma

1. for some use cases string value represent hash code is used. The string only 
consist of [0~9A~F] (hex values), so two characters can be squashed into one 
2. The current IntegerDimEnc does not support negative values, need another 
IntegerDimEnc that supports negative values

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