Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/20978#discussion_r179467893
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/Window.scala ---
@@ -33,6 +33,10 @@ import org.apache.spark.sql.catalyst.expressions._
* Window.partitionBy("country").orderBy("date").rowsBetween(-3, 3)
* }}}
*
+ * @note When ordering is not defined, the default frame boundaries are
(rowFrame,
--- End diff --
I tried to improve the wording (feel free not to use this):
```
When ordering is not defined, an unbounded window frame (rowFrame,
unboundedPreceding, unboundedFollowing) is used by default. When ordering is
defined, a growing window frame (rangeFrame, unboundedPreceding, currentRow) is
used by default.
```
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