Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18926#discussion_r132847782 --- Diff: python/pyspark/sql/column.py --- @@ -406,7 +406,13 @@ def substr(self, startPos, length): [Row(col=u'Ali'), Row(col=u'Bob')] """ if type(startPos) != type(length): - raise TypeError("Can not mix the type") + raise TypeError( + "startPos and length must be the same type. " + "Got {startPos_t} and {length_t}, respectively." --- End diff -- If PySpark always needs to check the types, are we doing the same things in all the other function calls? In addition, why not directly checking ```Python if isinstance(length, (int, long)): ```
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