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-- Функция получения планируемого количества строк CREATE FUNCTION row_estimator(query TEXT) RETURNS BIGINT LANGUAGE plpgsql AS $$ DECLARE plan JSONB; BEGIN EXECUTE 'EXPLAIN (FORMAT JSON) ' || query INTO plan; RETURN (plan->0->'Plan'->>'Plan Rows')::BIGINT; END; $$; -- Тестовые данные CREATE TABLE person (id INT, name TEXT, age INT); INSERT INTO person (id, name, age) VALUES (generate_series(1, 10000), 'Person # ' || TRUNC(RANDOM()*10000), TRUNC(RANDOM() * 100)); ANALYZE person; -- Расчет по COUNT SELECT COUNT(*) FROM person WHERE age > 85; -- Расчет по функции SELECT row_estimator('SELECT * FROM person WHERE age > 85');

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