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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