[jira] [Created] (FLINK-28132) Should we remove type validations when using lookup-key join ?

["Zha Ji (Jira)" <ji...@apache.org>]

Zha Ji created FLINK-28132:
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             Summary: Should we remove type validations when using lookup-key join ?
                 Key: FLINK-28132
                 URL: https://issues.apache.org/jira/browse/FLINK-28132
             Project: Flink
          Issue Type: Improvement
          Components: Connectors / JDBC, Table SQL / Planner
    Affects Versions: 1.15.0
            Reporter: Zha Ji


As described in https://issues.apache.org/jira/browse/FLINK-18234

 

Execute sql

{color:#6a8759}select * from t left join jdbc_source for system_time as of t.proctime AS j on t.id = j.id{color}

t.id(VARCHAR) j.id(INT) will throw exception 
org.apache.flink.table.api.TableException: VARCHAR(2147483647) and INTEGER does not have common type now

If I remove some type validation codes, the sql works well on MySQL

 

Is it necessary to check data types when we join stream data to dynamic tables



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