HyukjinKwon commented on code in PR #37592:
URL: https://github.com/apache/spark/pull/37592#discussion_r950952825
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python/pyspark/sql/functions.py:
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@@ -1037,6 +1084,22 @@ def expm1(col: "ColumnOrName") -> Column:
Computes the exponential of the given value minus one.
.. versionadded:: 1.4.0
+
+ Parameters
+ ----------
+ col : :class:`~pyspark.sql.Column` or str
+ column to calculate exponential for.
+
+ Returns
+ -------
+ :class:`~pyspark.sql.Column`
+ exponential less one.
+
+ Examples
+ --------
+ >>> df = spark.range(1)
+ >>> df.select(expm1(lit(1))).first() # doctest: +ELLIPSIS
+ Row(EXPM1(1)=1.71828...)
Review Comment:
This is a nice trick. In this way, the test won't be flaky even when the
precision changes. If you use `show()`, it might break. BTW you can remove `#
doctest: +ELLIPSIS` since that's defined in the bottom of this file.
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