Ben created SPARK-31306:
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Summary: rand() function documentation suggests an inclusive upper
bound of 1.0
Key: SPARK-31306
URL: https://issues.apache.org/jira/browse/SPARK-31306
Project: Spark
Issue Type: Documentation
Components: PySpark, R, Spark Core
Affects Versions: 2.4.5, 3.0.0
Reporter: Ben
`rand()` uses `Rand()` - which generates values in [0, 1) ([documented
here](https://github.com/apache/spark/blob/a1dbcd13a3eeaee50cc1a46e909f9478d6d55177/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala#L71)).
The existing documentation suggests that 1.0 is a possible value returned by
rand (i.e for a distribution written as `X ~ U(a, b)`, x can be a or b, so
`U[0.0, 1.0]` suggests the value returned could include 1.0).
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