Additional queries for ClickBench by DeepSeek V4 Flash

[4ertus2]

Closes #1488

Timings for the 15 added queries (Q44–58), best-of-3, seconds:

Q	Query pattern	ClickHouse	DuckDB	ch/dd
44	RANK() OVER (ORDER BY EventTime)	14.337	1.874	7.65
45	SELECT * ... ORDER BY ClientIP, EventTime LIMIT 100	18.893	2.939	6.43
46	AVG(length(Referer)) ... HAVING count()>100000	2.449	0.665	3.68
47	GROUP BY BrowserCountry, BrowserLanguage	0.773	0.223	3.47
48	GROUP BY Title, URL	10.577	3.511	3.01
49	countIf(NOT match(URL,'^https'))	1.570	0.664	2.36
50	countIf(position(URL,'google')>0)	1.573	0.728	2.16
51	lagInFrame(EventTime) OVER (PARTITION BY CounterID)	0.236	0.112	2.11
52	MIN(URL), MAX(URL)	1.630	0.683	2.39
53	ORDER BY length(URL) DESC LIMIT 10	1.435	0.779	1.84
54	GROUP BY substr(URL,1,8)	1.474	0.797	1.85
55	quantilesExact(0.1,0.5,0.9)(ResponseEndTiming)	0.365	1.299	0.28
56	quantileExact(0.99)(ResponseEndTiming)	0.285	0.463	0.62
57	GROUP BY toHour(toDateTime(EventTime))	0.221	0.323	0.68
58	GROUP BY EventTime ORDER BY count() DESC	0.443	0.645	0.69

Ratio >1 = DuckDB faster, <1 = ClickHouse faster.

Biggest discriminators: Q44 global window sort (7.7x DD), Q45 full-row multi-key sort (6.4x DD), Q48 two-string GROUP BY (3.0x DD), and Q55 multi-quantile (3.6x CH). Note Q44/45/48 cost 10–24s on ClickHouse, so they dominate total sweep time.