test: Add a test case for #2639

Author: andrewmbenton

internal/endtoend/testdata/select_subquery/postgresql/issue.md

@@ -0,0 +1 @@
+https://github.com/sqlc-dev/sqlc/pull/2639

internal/endtoend/testdata/select_subquery/postgresql/stdlib/exec.json

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+{
+    "contexts": ["managed-db"]
+}

internal/endtoend/testdata/select_subquery/postgresql/stdlib/go/db.go

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+-- name: Subquery :many
+SELECT 
+	a,
+	name,
+	(SELECT alias FROM bar WHERE bar.a=foo.a AND alias = $1 ORDER BY bar.a DESC limit 1) as alias
+FROM FOO WHERE a = $2;

internal/endtoend/testdata/select_subquery/postgresql/stdlib/go/models.go

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+CREATE TABLE foo (a int not null, name text);
+CREATE TABLE bar (a int not null, alias text);

internal/endtoend/testdata/select_subquery/postgresql/stdlib/go/query.sql.go

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+version: "2"
+sql:
+  - engine: "postgresql"
+    schema: "schema.sql"
+    queries: "query.sql"
+    gen:
+      go:
+        package: "querytest"
+        out: "go"
+        sql_package: "database/sql"