Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3641
Sorry, I think did not explain the change correctly.
I did not mean to group multiple record together.
We still emit one row per input row, but given the following input
```
(proc-time, id, a)
(1, a, 1)
(2, b, 2)
(3, c, 3)
(3, d, 4)
(4, e, 5)
```
and the query
```
SELECT id, sum(a) OVER (ORDER BY proctime RANGE BETWEEN 2 PRECEDING AND
CURRENT ROW) FROM x
```
the result would not be
```
(a, 1), (b, 3), (c, 6), (d, 10), (e, 14)
```
and not
```
(a, 1), (b, 3), (c, 10), (d, 10), (e, 14)
```
Because `c` and `d` arrived at the same time, their aggregations need to be
the same.
This is actually also the implementation for event-time OVER RANGE windows.
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