Q Kang created CALCITE-4977:
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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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