Github user jaceklaskowski commented on a diff in the pull request:
https://github.com/apache/spark/pull/17417#discussion_r108035549
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/Window.scala ---
@@ -113,12 +113,12 @@ object Window {
* Creates a [[WindowSpec]] with the frame boundaries defined,
* from `start` (inclusive) to `end` (inclusive).
*
- * Both `start` and `end` are relative positions from the current row.
For example, "0" means
+ * Both `start` and `end` are relative positions to the current row. For
example, "0" means
* "current row", while "-1" means the row before the current row, and
"5" means the fifth row
* after the current row.
*
- * We recommend users use `Window.unboundedPreceding`,
`Window.unboundedFollowing`,
- * and `Window.currentRow` to specify special boundary values, rather
than using integral
+ * We recommend users to use [[Window.unboundedPreceding]],
[[Window.unboundedFollowing]],
--- End diff --
Leaving 'that' aside is incorrect -- see
http://dictionary.cambridge.org/dictionary/english/recommend where *to* is even
highlighted to make the point.
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