[jira] [Created] (FLINK-12116) Args autocast will cause exception for plan transformation in TableAPI

[Shang Yuanchun (Jira)]

Xingcan Cui created FLINK-12116:
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             Summary: Args autocast will cause exception for plan transformation in TableAPI
                 Key: FLINK-12116
                 URL: https://issues.apache.org/jira/browse/FLINK-12116
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.7.2, 1.6.4
            Reporter: Xingcan Cui


In tableAPI, the automatic typecast for arguments may break their initial structures, which makes {{TreeNode.makeCopy()}} fail.

Take the {{ConcatWs}} function as an example. It requires a string {{Expression}} sequence for the second parameter of its constructor. If we provide some {{Expressions}} with other types, the planner will try to cast them automatically. However, during this process, the arguments will be incorrectly unwrapped (e.g., {{[f1, f2]}} will be unwrapped to two expressions {{f1.cast(String)}} and {{f2.cast(String)}}) which will cause {{java.lang.IllegalArgumentException: wrong number of arguments}}.

As a workaround, we can cast these arguments manually.



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