ClickHouse/tests/queries/0_stateless/01611_constant_folding_subqueries.sql

-- { echo }
SELECT * FROM (SELECT (SELECT * FROM system.numbers LIMIT 1 OFFSET 1) AS n, toUInt64(10 / n)) FORMAT CSV;
SELECT (SELECT * FROM system.numbers LIMIT 1 OFFSET 1) AS n, toUInt64(10 / n) FORMAT CSV;
EXPLAIN SYNTAX SELECT (SELECT * FROM system.numbers LIMIT 1 OFFSET 1) AS n, toUInt64(10 / n);
Fix constant folding for expressions depends from subqueries result Do not use subquery result, when value is unknown, for constant folding. v2: fix simple subqueries, fixes 00597_push_down_predicate. v3: - use identity over introducing yet another cast analog (as suggested by @akuzm) - simpler suitable_for_const_folding check v4: use identity(cast()) since only cast() can provide corrent type (for data types that does not have it's own type, i.e. DateTime) v5: do not optimize consts if only_analyze isset, regardless the block content 2020-12-23 19:36:10 +00:00			`-- { echo }`
			`SELECT * FROM (SELECT (SELECT * FROM system.numbers LIMIT 1 OFFSET 1) AS n, toUInt64(10 / n)) FORMAT CSV;`
			`SELECT (SELECT * FROM system.numbers LIMIT 1 OFFSET 1) AS n, toUInt64(10 / n) FORMAT CSV;`
			`EXPLAIN SYNTAX SELECT (SELECT * FROM system.numbers LIMIT 1 OFFSET 1) AS n, toUInt64(10 / n);`