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

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

     [ https://issues.apache.org/jira/browse/FLINK-14064?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

hailong wang closed FLINK-14064.
--------------------------------
    Resolution: Invalid

> 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
>            Priority: Major
>
> 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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