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sqlglot/tests/fixtures/optimizer/optimize_joins.sql

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SELECT * FROM x JOIN y ON y.a = 1 JOIN z ON x.a = z.a AND y.a = z.a;
SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = 1 AND y.a = z.a;
SELECT * FROM x JOIN y ON y.a = 1 JOIN z ON x.a = z.a;
SELECT * FROM x JOIN y ON y.a = 1 JOIN z ON x.a = z.a;
SELECT * FROM x CROSS JOIN y JOIN z ON x.a = z.a AND y.a = z.a;
SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = z.a;
SELECT * FROM x LEFT JOIN y ON y.a = 1 JOIN z ON x.a = z.a AND y.a = z.a;
SELECT * FROM x JOIN z ON x.a = z.a AND TRUE LEFT JOIN y ON y.a = 1 AND y.a = z.a;
SELECT * FROM x INNER JOIN z;
SELECT * FROM x JOIN z;
SELECT * FROM x LEFT OUTER JOIN z;
SELECT * FROM x LEFT JOIN z;
SELECT * FROM x CROSS JOIN z;
SELECT * FROM x CROSS JOIN z;