Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20787#discussion_r175668391
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -1115,13 +1115,18 @@ case class AddMonths(startDate: Expression,
numMonths: Expression)
override def prettyName: String = "add_months"
}
-
/**
- * Returns number of months between dates date1 and date2.
- */
+ * Returns number of months between dates `date1` and `date2`.
+ * If `date1` is later than `date2`, then the result is positive.
--- End diff --
`date` -> `timestamp`
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