HeartSaVioR commented on a change in pull request #33081:
URL: https://github.com/apache/spark/pull/33081#discussion_r670219318
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File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
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@@ -3630,6 +3630,35 @@ object functions {
window(timeColumn, windowDuration, windowDuration, "0 second")
}
+ /**
+ * Generates session window given a timestamp specifying column.
+ *
+ * Session window is the one of dynamic windows, which means the length of
window is vary
+ * according to the given inputs. The length of session window is defined as
"the timestamp
+ * of latest input of the session + gap duration", so when the new inputs
are bound to the
+ * current session window, the end time of session window can be expanded
according to the new
+ * inputs.
+ *
+ * Windows can support microsecond precision. Windows in the order of months
are not supported.
Review comment:
We don't support the interval duration of window equal or more than a
month. This is borrowed from `window` method doc, but I guess I need to change
`Windows` to `gapDuration` to make clear.
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