Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/12147#discussion_r121570239
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/WindowSpec.scala ---
@@ -113,7 +132,25 @@ class WindowSpec private[sql](
between(RangeFrame, start, end)
}
- private def between(typ: FrameType, start: Long, end: Long): WindowSpec
= {
+ /**
+ * Defines the frame boundaries, from `start` (inclusive) to `end`
(inclusive). And specifies
+ * potential exclude type
+ *
+ * Both `start` and `end` are relative from the current row. For
example, "0" means "current row",
+ * while "-1" means one off before the current row, and "5" means the
five off after the
+ * current row.
+ *
+ * @param start boundary start, inclusive.
+ * The frame is unbounded if this is the minimum long value.
+ * @param end boundary end, inclusive.
+ * The frame is unbounded if this is the maximum long value.
+ * @since 1.4.0
--- End diff --
1.4.0?
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