[jira] [Created] (KYLIN-3739) Use table alias rather than table identity for snapshots in CubeSegment, CubeInstance, CubeDesc

["Zhong Yanghong (JIRA)" <ji...@apache.org>]

Zhong Yanghong created KYLIN-3739:
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             Summary: Use table alias rather than table identity for snapshots in CubeSegment, CubeInstance, CubeDesc
                 Key: KYLIN-3739
                 URL: https://issues.apache.org/jira/browse/KYLIN-3739
             Project: Kylin
          Issue Type: Improvement
          Components: Metadata
            Reporter: Zhong Yanghong


In 2.0.0, Kylin introduced table alias in DataModelDesc. Most of the elements in CubeDesc, CubeInstance & CubeSegment use the table alias rather than the table identity. However, for the lookup table snapshots, it still uses table identity. 

It's better for us to use only table alias instead of table identity in CubeDesc, CubeInstance & CubeSegment. If so, it can provide several advantages:
# For CubeDesc, CubeInstance & CubeSegment, what exposed to them is only the snowflake model and they don't need to care which real table is used.
# If users want to change the table name in the snowflake model, we can still keep the table alias unchanged and what we need to change is only the DataModelDesc. And we don't need to do any change for CubeDesc, CubeInstance & CubeSegment.



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