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Posted to issues@calcite.apache.org by "Q Kang (Jira)" <ji...@apache.org> on 2022/01/09 13:11:00 UTC

[jira] [Created] (CALCITE-4977) Support Snapshot in RelMdColumnOrigins

Q Kang created CALCITE-4977:
-------------------------------

             Summary: Support Snapshot in RelMdColumnOrigins
                 Key: CALCITE-4977
                 URL: https://issues.apache.org/jira/browse/CALCITE-4977
             Project: Calcite
          Issue Type: Improvement
          Components: core
    Affects Versions: 1.29.0
            Reporter: Q Kang


Currently `RelMdColumnOrigins` does not define a specialized method for `Snapshot` node. Thus, a request for origin column on a temporal query will always return NULL.

For example:
{code:java}
select productid from products_temporal
for system_time as of timestamp '2011-01-02 00:00:00' {code}
The origin column of `productid` is NULL.

We could simply propagate the call to its children like many other RelNode types do.



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