ClickHouse/tests/queries/0_stateless/03101_analyzer_identifiers_2.sql

-- https://github.com/ClickHouse/ClickHouse/issues/23194
SET enable_analyzer = 1;

CREATE TEMPORARY TABLE test1 (a String, nest Nested(x String, y String));

SELECT a, nest.* FROM test1 ARRAY JOIN nest;
SELECT a, n.* FROM test1 ARRAY JOIN nest AS n;

CREATE TEMPORARY TABLE test2 (a String, nest Array(Tuple(x String, y String)));

SELECT a, nest.* FROM test2 ARRAY JOIN nest;
SELECT a, n.* FROM test2 ARRAY JOIN nest AS n;


SELECT 1 AS x, x, x + 1;
SELECT x, x + 1, 1 AS x;
SELECT x, 1 + (2 + (3 AS x));

SELECT '---';

SELECT 123 AS x FROM (SELECT a, x FROM (SELECT 1 AS a, 2 AS b));

SELECT '---';

SELECT 123 AS x, (SELECT x) AS y;
SELECT 123 AS x, 123 IN (SELECT x);

SELECT '---';

WITH 123 AS x SELECT 555 FROM (SELECT a, x FROM (SELECT 1 AS a, 2 AS b));

SELECT '---';

-- here we refer to table `test1` (defined as subquery) three times, one of them inside another scalar subquery.
WITH t AS (SELECT 1) SELECT t, (SELECT * FROM t) FROM t; -- { serverError UNKNOWN_IDENTIFIER }

-- throws, because x is not visible outside.
SELECT x FROM (SELECT y FROM VALUES ('y UInt16', (2)) WHERE (1 AS x) = y) AS t;  -- { serverError UNKNOWN_IDENTIFIER }

-- throws, because the table name `t` is not visible outside
SELECT t.x FROM (SELECT * FROM (SELECT 1 AS x) AS t); -- { serverError UNKNOWN_IDENTIFIER }
SELECT x FROM (SELECT * FROM (SELECT 99 AS x) AS t);

SELECT '---';

SELECT t.x FROM (SELECT 1 AS x) AS t;
SELECT t.a FROM (SELECT a FROM test1) AS t;
SELECT a FROM (SELECT a FROM test1) AS t;

SELECT '---';

-- this is wrong, the `tbl` name is not exported
SELECT test1.a FROM (SELECT a FROM test1) AS t; -- { serverError UNKNOWN_IDENTIFIER }
-- this is also wrong, the `t2` alias is not exported
SELECT test1.a FROM (SELECT a FROM test1 AS t2) AS t; -- { serverError UNKNOWN_IDENTIFIER }


-- does not work, `x` is not visible;
SELECT x, (SELECT 1 AS x); -- { serverError UNKNOWN_IDENTIFIER }
-- does not work either;
SELECT x IN (SELECT 1 AS x); -- { serverError UNKNOWN_IDENTIFIER }
-- this will work, but keep in mind that there are two different `x`.
SELECT x IN (SELECT 1 AS x) FROM (SELECT 1 AS x);

SELECT '---';

SELECT x + 1 AS x, x FROM (SELECT 1 AS x);
SELECT x, x + 1 AS x FROM (SELECT 1 AS x);
SELECT 1 AS x, 2 AS x; -- { serverError MULTIPLE_EXPRESSIONS_FOR_ALIAS }

SELECT '---';


SELECT arrayMap(x -> x + 1, [1, 2]);

SELECT x, arrayMap((x, y) -> x[1] + y + arrayFirst(x -> x != y, x), arr) FROM (SELECT 1 AS x, [([1, 2], 3), ([4, 5], 6)] AS arr);

SELECT x1, arrayMap((x2, y2) -> x2[1] + y2 + arrayFirst(x3 -> x3 != y2, x2), arr) FROM (SELECT 1 AS x1, [([1, 2], 3), ([4, 5], 6)] AS arr);

SELECT arrayMap(x -> [y * 2, (x + 1) AS y, 1 AS z], [1, 2]), y; -- { serverError UNKNOWN_IDENTIFIER }

-- TODO: this must work
--SELECT arrayMap(x -> [y * 2, (x + 1) AS y, 1 AS z], [1, 2]), z;

SELECT arrayMap(x -> (x + 1) AS y, [3, 5]), arrayMap(x -> (x || 'hello') AS y, ['qq', 'ww']);  -- { serverError MULTIPLE_EXPRESSIONS_FOR_ALIAS }