# name: benchmark/micro/optimizer/topn_window_elimination.benchmark
# description: Benchmark of top n window elimination
# group: [optimizer]

name TopN Window Elimination
group micro
subgroup optimizer

load
CREATE TABLE metrics AS (
	SELECT k, '2001-01-01 00:00:00'::TIMESTAMP + INTERVAL (v) MINUTE AS tm, v AS v1, v % 1000 AS v2, v % 100 as v3
	FROM range(0,100000) vals(v), range(0,100) keys(k)
);
CREATE TABLE tags AS (
	SELECT k, CAST(hash(k+1) AS VARCHAR) t1, CAST(hash(k+2) AS VARCHAR) t2, CAST(hash(k+3) AS VARCHAR) t3,
	FROM range(0,100) keys(k)
);

run
SELECT * FROM tags t INNER JOIN LATERAL (SELECT * FROM metrics m WHERE m.k = t.k ORDER BY tm DESC LIMIT 1) AS b ON true ORDER BY t.k, b.tm DESC;
SELECT * FROM tags t INNER JOIN LATERAL (SELECT * FROM metrics m WHERE m.k = t.k ORDER BY tm DESC LIMIT 3) AS b ON true ORDER BY t.k, b.tm DESC;
SELECT * FROM tags t, (SELECT *, row_number() OVER (PARTITION BY m.k ORDER BY m.tm DESC) rn FROM metrics m QUALIFY rn <= 1) m WHERE t.k = m.k;
SELECT * FROM tags t, (SELECT *, row_number() OVER (PARTITION BY m.k ORDER BY m.tm DESC) rn FROM metrics m QUALIFY rn <= 3) m WHERE t.k = m.k;