Hi Vik and Champion,
I think the current RPR patch is not quite correct in handling
count(*).
(using slightly modified version of Vik's example query)
SELECT v.a, count(*) OVER w
FROM (VALUES ('A'),('B'),('B'),('C')) AS v (a)
WINDOW w AS (
ORDER BY v.a
ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
PATTERN (B+)
DEFINE B AS a = 'B'
)
a | count
---+-------
A | 0
B | 2
B |
C | 0
(4 rows)
Here row 3 is skipped because the pattern B matches row 2 and 3. In
this case I think cont(*) should return 0 rathern than NULL for row 3.
What do you think?
Best reagards,
--
Tatsuo Ishii
SRA OSS LLC
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp
