Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18814#discussion_r131701948
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/Window.scala ---
@@ -210,6 +210,57 @@ object Window {
spec.rangeBetween(start, end)
}
+ /**
+ * Creates a [[WindowSpec]] with the frame boundaries defined,
+ * from `start` (inclusive) to `end` (inclusive).
+ *
+ * Both `start` and `end` are relative to the current row. For example,
"lit(0)" means
+ * "current row", while "lit(-1)" means one off before the current row,
and "lit(5)" means the
+ * five off after the current row.
+ *
+ * Users should use `unboundedPreceding()`, `unboundedFollowing()`, and
`currentRow()` to specify
--- End diff --
let's mention that these 3 functions are from `object functions`
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