[
https://issues.apache.org/jira/browse/KYLIN-3739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16728656#comment-16728656
]
Zhong Yanghong commented on KYLIN-3739:
---------------------------------------
Hi [~Shaofengshi], there's no impact on the data under '/table_snapshot'.
* In CubeInstance & CubeSegment, there's a map for snapshots. The value will
not be changed. Only the key will be replaced by table alias instead of table
identity.
* In CubeDesc, there's a list of SnapshotTableDesc for cube-level snapshots. In
SnapshotTableDesc, the tableName should be table alias instead of table
identity.
> 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
> Priority: Major
>
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
