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https://issues.apache.org/jira/browse/FLINK-12116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xingcan Cui updated FLINK-12116:
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Labels: (was: pull-request-available)
> 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: 1.6.4, 1.7.2
> Reporter: Xingcan Cui
> Assignee: vinoyang
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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}} for
> {{Constructor.newInstance()}}.
> As a workaround, we can cast these arguments manually.
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