[jira] [Created] (FLINK-14064) Support Project Push down to LookupableTableSource

["hailong wang (Jira)" <ji...@apache.org>]

hailong wang created FLINK-14064:
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             Summary: Support Project Push down to LookupableTableSource
                 Key: FLINK-14064
                 URL: https://issues.apache.org/jira/browse/FLINK-14064
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
    Affects Versions: 1.9.0
            Reporter: hailong wang
             Fix For: 1.10.0


Consider such a temporal join sql:

 
{code:java}
SELECT T.id, D.id, D.name FROM T JOIN temporalTable for system_time AS OF T.proctime AS D ON upper(T.id) = upper(D.id)
{code}
When apply a sql function to equivalent condition such as 'upper', it doesn't support. In other words, temporal join don't support any transfrom on temporal  table primary key field.

There are two reasons:

1、In CommonLookupJoin.getIdenticalSourceField method, we can not get the input index when expr is a rexCall except IN_FENNEL and CAST;

2、StreamExecLookupJoinRule doesn't push down project function to LookupableTableSource, so LookupFunction can not perceive the transfrom of primary key.

 



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