sqlglot/tests/fixtures/optimizer/qualify_columns__with_invisible.sql

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-- Qualify columns
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SELECT a FROM x;
SELECT x.a AS a FROM x AS x;

SELECT b FROM x;
SELECT x.b AS b FROM x AS x;

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-- Derived tables
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SELECT x.a FROM x AS x JOIN (SELECT * FROM x);
SELECT x.a AS a FROM x AS x JOIN (SELECT x.a AS a FROM x AS x) AS _q_0;

SELECT x.b FROM x AS x JOIN (SELECT b FROM x);
SELECT x.b AS b FROM x AS x JOIN (SELECT x.b AS b FROM x AS x) AS _q_0;

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-- Expand *
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SELECT * FROM x;
SELECT x.a AS a FROM x AS x;

SELECT * FROM y JOIN z ON y.b = z.b;
SELECT y.b AS b, z.b AS b FROM y AS y JOIN z AS z ON y.b = z.b;

SELECT * FROM y JOIN z ON y.c = z.c;
SELECT y.b AS b, z.b AS b FROM y AS y JOIN z AS z ON y.c = z.c;

SELECT a FROM (SELECT * FROM x);
SELECT _q_0.a AS a FROM (SELECT x.a AS a FROM x AS x) AS _q_0;

SELECT * FROM (SELECT a FROM x);
SELECT _q_0.a AS a FROM (SELECT x.a AS a FROM x AS x) AS _q_0;