The target of a join transform must be a string.
联接转换的目标必须是字符串。
Combined, they say to invoke the String action method of the Object target.
它们结合在一起说明调用Object目标的String操作方法。
The Concat function will concatenate two or more strings from the source into a single string value on the target side.
Concat 函数将来自源的两个或多个字符串在目标端连接成一个单一的字符串值。
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