Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/21482#discussion_r197989956 --- Diff: python/pyspark/sql/column.py --- @@ -514,6 +514,17 @@ def isin(self, *cols): desc_nulls_first = ignore_unicode_prefix(_unary_op("desc_nulls_first", _desc_nulls_first_doc)) desc_nulls_last = ignore_unicode_prefix(_unary_op("desc_nulls_last", _desc_nulls_last_doc)) + _isInf_doc = """ + True if the current expression is inf. + + >>> from pyspark.sql import Row + >>> df = spark.createDataFrame([ + Row(name=u'Tom', height=80.0), + Row(name=u'Alice', height=float('inf')) --- End diff -- dots are required as written in https://github.com/apache/spark/pull/21482#discussion_r197626112
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