Adding upstream version 6.2.6.
Signed-off-by: Daniel Baumann <daniel@debian.org>
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49 changed files with 1741 additions and 566 deletions
119
tests/fixtures/optimizer/eliminate_subqueries.sql
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119
tests/fixtures/optimizer/eliminate_subqueries.sql
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@ -1,42 +1,79 @@
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SELECT 1 AS x, 2 AS y
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UNION ALL
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SELECT 1 AS x, 2 AS y;
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WITH _e_0 AS (
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SELECT
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1 AS x,
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2 AS y
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)
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SELECT
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*
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FROM _e_0
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UNION ALL
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SELECT
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*
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FROM _e_0;
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-- No derived tables
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SELECT * FROM x;
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SELECT * FROM x;
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SELECT x.id
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FROM (
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SELECT *
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FROM x AS x
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JOIN y AS y
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ON x.id = y.id
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) AS x
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JOIN (
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SELECT *
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FROM x AS x
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JOIN y AS y
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ON x.id = y.id
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) AS y
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ON x.id = y.id;
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WITH _e_0 AS (
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SELECT
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*
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FROM x AS x
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JOIN y AS y
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ON x.id = y.id
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)
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SELECT
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x.id
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FROM "_e_0" AS x
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JOIN "_e_0" AS y
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ON x.id = y.id;
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-- Unaliased derived tables
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SELECT a FROM (SELECT b FROM (SELECT c FROM x));
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WITH cte AS (SELECT c FROM x), cte_2 AS (SELECT b FROM cte AS cte) SELECT a FROM cte_2 AS cte_2;
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-- Joined derived table inside nested derived table
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SELECT b FROM (SELECT b FROM (SELECT b FROM x JOIN (SELECT b FROM y) AS y ON x.b = y.b));
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WITH y_2 AS (SELECT b FROM y), cte AS (SELECT b FROM x JOIN y_2 AS y ON x.b = y.b), cte_2 AS (SELECT b FROM cte AS cte) SELECT b FROM cte_2 AS cte_2;
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-- Aliased derived tables
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SELECT a FROM (SELECT b FROM (SELECT c FROM x) AS y) AS z;
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WITH y AS (SELECT c FROM x), z AS (SELECT b FROM y AS y) SELECT a FROM z AS z;
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-- Existing CTEs
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WITH q AS (SELECT c FROM x) SELECT a FROM (SELECT b FROM q AS y) AS z;
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WITH q AS (SELECT c FROM x), z AS (SELECT b FROM q AS y) SELECT a FROM z AS z;
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-- Derived table inside CTE
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WITH x AS (SELECT a FROM (SELECT a FROM x) AS y) SELECT a FROM x;
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WITH y AS (SELECT a FROM x), x AS (SELECT a FROM y AS y) SELECT a FROM x;
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-- Name conflicts with existing outer derived table
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SELECT a FROM (SELECT b FROM (SELECT c FROM x) AS y) AS y;
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WITH y AS (SELECT c FROM x), y_2 AS (SELECT b FROM y AS y) SELECT a FROM y_2 AS y;
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-- Name conflicts with outer join
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SELECT a, b FROM (SELECT c FROM (SELECT d FROM x) AS x) AS y JOIN x ON x.a = y.a;
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WITH x_2 AS (SELECT d FROM x), y AS (SELECT c FROM x_2 AS x) SELECT a, b FROM y AS y JOIN x ON x.a = y.a;
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-- Name conflicts with table name that is selected in another branch
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SELECT * FROM (SELECT * FROM (SELECT a FROM x) AS x) AS y JOIN (SELECT * FROM x) AS z ON x.a = y.a;
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WITH x_2 AS (SELECT a FROM x), y AS (SELECT * FROM x_2 AS x), z AS (SELECT * FROM x) SELECT * FROM y AS y JOIN z AS z ON x.a = y.a;
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-- Name conflicts with table alias
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SELECT a FROM (SELECT a FROM (SELECT a FROM x) AS y) AS z JOIN q AS y;
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WITH y AS (SELECT a FROM x), z AS (SELECT a FROM y AS y) SELECT a FROM z AS z JOIN q AS y;
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-- Name conflicts with existing CTE
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WITH y AS (SELECT a FROM (SELECT a FROM x) AS y) SELECT a FROM y;
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WITH y_2 AS (SELECT a FROM x), y AS (SELECT a FROM y_2 AS y) SELECT a FROM y;
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-- Union
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SELECT 1 AS x, 2 AS y UNION ALL SELECT 1 AS x, 2 AS y;
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WITH cte AS (SELECT 1 AS x, 2 AS y) SELECT cte.x AS x, cte.y AS y FROM cte AS cte UNION ALL SELECT cte.x AS x, cte.y AS y FROM cte AS cte;
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-- Union of selects with derived tables
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(SELECT a FROM (SELECT b FROM x)) UNION (SELECT a FROM (SELECT b FROM y));
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WITH cte AS (SELECT b FROM x), cte_2 AS (SELECT a FROM cte AS cte), cte_3 AS (SELECT b FROM y), cte_4 AS (SELECT a FROM cte_3 AS cte_3) (SELECT cte_2.a AS a FROM cte_2 AS cte_2) UNION (SELECT cte_4.a AS a FROM cte_4 AS cte_4);
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-- Subquery
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SELECT a FROM x WHERE b = (SELECT y.c FROM y);
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SELECT a FROM x WHERE b = (SELECT y.c FROM y);
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-- Correlated subquery
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SELECT a FROM x WHERE b = (SELECT c FROM y WHERE y.a = x.a);
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SELECT a FROM x WHERE b = (SELECT c FROM y WHERE y.a = x.a);
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-- Duplicate CTE
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SELECT a FROM (SELECT b FROM x) AS y JOIN (SELECT b FROM x) AS z;
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WITH y AS (SELECT b FROM x) SELECT a FROM y AS y JOIN y AS z;
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-- Doubly duplicate CTE
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SELECT * FROM (SELECT * FROM x JOIN (SELECT * FROM x) AS y) AS z JOIN (SELECT * FROM x JOIN (SELECT * FROM x) AS y) AS q;
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WITH y AS (SELECT * FROM x), z AS (SELECT * FROM x JOIN y AS y) SELECT * FROM z AS z JOIN z AS q;
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-- Another duplicate...
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SELECT x.id FROM (SELECT * FROM x AS x JOIN y AS y ON x.id = y.id) AS x JOIN (SELECT * FROM x AS x JOIN y AS y ON x.id = y.id) AS y ON x.id = y.id;
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WITH x_2 AS (SELECT * FROM x AS x JOIN y AS y ON x.id = y.id) SELECT x.id FROM x_2 AS x JOIN x_2 AS y ON x.id = y.id;
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-- Root subquery
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(SELECT * FROM (SELECT * FROM x)) LIMIT 1;
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(WITH cte AS (SELECT * FROM x) SELECT * FROM cte AS cte) LIMIT 1;
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-- Existing duplicate CTE
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WITH y AS (SELECT a FROM x) SELECT a FROM (SELECT a FROM x) AS y JOIN y AS z;
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WITH y AS (SELECT a FROM x) SELECT a FROM y AS y JOIN y AS z;
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