zhengruifeng commented on code in PR #44794:
URL: https://github.com/apache/spark/pull/44794#discussion_r1458881539
##########
python/pyspark/sql/functions/builtin.py:
##########
@@ -1488,31 +1533,66 @@ def acos(col: "ColumnOrName") -> Column:
Parameters
----------
col : :class:`~pyspark.sql.Column` or str
- target column to compute on.
+ The target column or expression to compute the inverse cosine on.
Returns
-------
:class:`~pyspark.sql.Column`
- inverse cosine of `col`, as if computed by `java.lang.Math.acos()`
+ A new column object representing the inverse cosine of the input.
Examples
--------
- >>> df = spark.range(1, 3)
- >>> df.select(acos(df.id)).show()
- +--------+
- |ACOS(id)|
- +--------+
- | 0.0|
- | NaN|
- +--------+
+ Example 1: Compute the inverse cosine of a column of numbers
+
+ >>> from pyspark.sql import functions as sf
+ >>> df = spark.createDataFrame([(-1.0,), (-0.5,), (0.0,), (0.5,), (1.0,)],
["value"])
+ >>> df.select("value",
+ ... sf.substring(sf.acos("value"), 0, 15).alias("ACOS(value)"),
+ ... sf.substring(sf.degrees(sf.acos("value")), 0,
5).alias("DEGREES(ACOS(value))")
+ ... ).show()
+ +-----+---------------+--------------------+
+ |value| ACOS(value)|DEGREES(ACOS(value))|
+ +-----+---------------+--------------------+
+ | -1.0|3.1415926535897| 180.0|
+ | -0.5|2.0943951023931| 120.0|
+ | 0.0|1.5707963267948| 90.0|
Review Comment:
```suggestion
| 0.0|1.5707963267...| 90.0|
```
and other similar places.
To make the result more stable: e.g. the doctest won't fail when we change
jdk version/python version/underlying engineer/etc.
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