Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18814#discussion_r131701648
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/Window.scala ---
@@ -167,17 +167,17 @@ object Window {
* current row.
*
* We recommend users use `Window.unboundedPreceding`,
`Window.unboundedFollowing`,
- * and `Window.currentRow` to specify special boundary values, rather
than using integral
- * values directly.
+ * and `Window.currentRow` to specify special boundary values, rather
than using long values
+ * directly.
*
* A range-based boundary is based on the actual value of the ORDER BY
* expression(s). An offset is used to alter the value of the ORDER BY
expression, for
* instance if the current order by expression has a value of 10 and the
lower bound offset
* is -3, the resulting lower bound for the current row will be 10 - 3 =
7. This however puts a
* number of constraints on the ORDER BY expressions: there can be only
one expression and this
- * expression must have a numerical data type. An exception can be made
when the offset is 0,
- * because no value modification is needed, in this case multiple and
non-numeric ORDER BY
- * expression are allowed.
+ * expression must have a literal data type. An exception can be made
when the offset is
--- End diff --
literal -> numerical or date or timestamp data type
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