Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/18926 ```Python if isinstance(startPos, int) and isinstance(length, int): jc = self._jc.substr(startPos, length) elif isinstance(startPos, Column) and isinstance(length, Column):: jc = self._jc.substr(startPos._jc, length._jc) else: raise TypeError(...) ``` This looks much cleaner to me.
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