PCC-02427：Expression is not of the correct character string type
错误码
错误描述：Expression is not of the correct character string type
错误原因：The given host variable expression was not declared to be of the required character type. In this case, one of several possible character types would have been accepted. However, the host variable type did not match any of them.
解决方法：Redeclare the problematic host variable, using one of the permitted character types.
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