ClickHouse/tests/queries/0_stateless/00740_optimize_predicate_expression.sql

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DROP TABLE IF EXISTS perf;
CREATE TABLE perf (site String, user_id UInt64, z Float64) ENGINE = Log;
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SELECT * FROM (SELECT perf_1.z AS z_1 FROM perf AS perf_1);
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SELECT sum(mul)/sqrt(sum(sqr_dif_1) * sum(sqr_dif_2)) AS z_r
FROM(
SELECT
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(SELECT avg(z_1) AS z_1_avg,
avg(z_2) AS z_2_avg
FROM (
SELECT perf_1.site, perf_1.z AS z_1
FROM perf AS perf_1
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WHERE user_id = 000
) jss1 ALL INNER JOIN (
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SELECT perf_2.site, perf_2.z AS z_2
FROM perf AS perf_2
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WHERE user_id = 999
) jss2 USING site) as avg_values,
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z_1 - avg_values.1 AS dif_1,
z_2 - avg_values.2 AS dif_2,
dif_1 * dif_2 AS mul,
dif_1*dif_1 AS sqr_dif_1,
dif_2*dif_2 AS sqr_dif_2
FROM (
SELECT perf_1.site, perf_1.z AS z_1
FROM perf AS perf_1
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WHERE user_id = 000
) js1 ALL INNER JOIN (
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SELECT perf_2.site, perf_2.z AS z_2
FROM perf AS perf_2
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WHERE user_id = 999
) js2 USING site);
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DROP TABLE perf;