GAUSS-00257：cannot assign to field '%s' of column '%s' because its type %s is not a composite type SQLSTATE: 42804
错误码
错误描述：cannot assign to field '%s' of column '%s' because its type %s is not a composite type SQLSTATE: 42804
错误原因：对非复合类型的变量指定field。
解决方法：不能对非复合类型的变量作此操作。
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