chore: view subquery test case

testdata/diff/create_view/add_view/diff.sql

@@ -66,3 +66,33 @@ CREATE OR REPLACE VIEW text_search_view AS
     to_tsvector('english'::regconfig, (((COALESCE(first_name, ''::character varying)::text || ' '::text) || COALESCE(last_name, ''::character varying)::text) || ' '::text) || COALESCE(bio, ''::text)) AS search_vector
    FROM employees
   WHERE status::text = 'active'::text;
+
+CREATE OR REPLACE VIEW union_subquery_view AS
+ SELECT id,
+    name,
+    source_type,
+        CASE
+            WHEN source_type = 'employee'::text THEN 'active'::text
+            WHEN source_type = 'department'::text THEN 'organizational'::text
+            ELSE 'unknown'::text
+        END AS category
+   FROM ((
+                 SELECT employees.id,
+                    employees.name,
+                    'employee'::text AS source_type
+                   FROM employees
+                  WHERE employees.status::text = 'active'::text
+                UNION
+                 SELECT departments.id,
+                    departments.name,
+                    'department'::text AS source_type
+                   FROM departments
+                  WHERE departments.manager_id IS NOT NULL
+        ) UNION ALL
+         SELECT employees.id,
+            COALESCE((employees.first_name::text || ' '::text) || employees.last_name::text, employees.name::text) AS name,
+            'employee_full'::text AS source_type
+           FROM employees
+          WHERE employees.priority > 10) combined_data
+  WHERE id IS NOT NULL
+  ORDER BY source_type, id;

testdata/diff/create_view/add_view/new.sql

@@ -102,3 +102,42 @@ FROM monthly_stats ms
 CROSS JOIN departments d
 LEFT JOIN employee_summary es ON d.id = es.department_id
 ORDER BY ms.month_start DESC, d.name;
+
+-- View testing UNION and UNION ALL in subqueries (regression test for issue #104)
+CREATE VIEW public.union_subquery_view AS
+SELECT
+    id,
+    name,
+    source_type,
+    -- Additional columns from the union result
+    CASE
+        WHEN source_type = 'employee' THEN 'active'
+        WHEN source_type = 'department' THEN 'organizational'
+        ELSE 'unknown'
+    END AS category
+FROM (
+    -- Simple UNION combining employees and departments (main issue from #104)
+    SELECT
+        id,
+        name,
+        'employee' AS source_type
+    FROM employees
+    WHERE status = 'active'
+    UNION
+    SELECT
+        id,
+        name,
+        'department' AS source_type
+    FROM departments
+    WHERE manager_id IS NOT NULL
+    -- UNION ALL variant (keep duplicates)
+    UNION ALL
+    SELECT
+        id,
+        COALESCE(first_name || ' ' || last_name, name) AS name,
+        'employee_full' AS source_type
+    FROM employees
+    WHERE priority > 10
+) AS combined_data
+WHERE id IS NOT NULL
+ORDER BY source_type, id;

testdata/diff/create_view/add_view/plan.json

@@ -31,6 +31,12 @@
           "type": "view",
           "operation": "create",
           "path": "public.text_search_view"
+        },
+        {
+          "sql": "CREATE OR REPLACE VIEW union_subquery_view AS\n SELECT id,\n    name,\n    source_type,\n        CASE\n            WHEN source_type = 'employee'::text THEN 'active'::text\n            WHEN source_type = 'department'::text THEN 'organizational'::text\n            ELSE 'unknown'::text\n        END AS category\n   FROM ((\n                 SELECT employees.id,\n                    employees.name,\n                    'employee'::text AS source_type\n                   FROM employees\n                  WHERE employees.status::text = 'active'::text\n                UNION\n                 SELECT departments.id,\n                    departments.name,\n                    'department'::text AS source_type\n                   FROM departments\n                  WHERE departments.manager_id IS NOT NULL\n        ) UNION ALL\n         SELECT employees.id,\n            COALESCE((employees.first_name::text || ' '::text) || employees.last_name::text, employees.name::text) AS name,\n            'employee_full'::text AS source_type\n           FROM employees\n          WHERE employees.priority > 10) combined_data\n  WHERE id IS NOT NULL\n  ORDER BY source_type, id;",
+          "type": "view",
+          "operation": "create",
+          "path": "public.union_subquery_view"
         }
       ]
     }

testdata/diff/create_view/add_view/plan.sql

@@ -66,3 +66,33 @@ CREATE OR REPLACE VIEW text_search_view AS
     to_tsvector('english'::regconfig, (((COALESCE(first_name, ''::character varying)::text || ' '::text) || COALESCE(last_name, ''::character varying)::text) || ' '::text) || COALESCE(bio, ''::text)) AS search_vector
    FROM employees
   WHERE status::text = 'active'::text;
+
+CREATE OR REPLACE VIEW union_subquery_view AS
+ SELECT id,
+    name,
+    source_type,
+        CASE
+            WHEN source_type = 'employee'::text THEN 'active'::text
+            WHEN source_type = 'department'::text THEN 'organizational'::text
+            ELSE 'unknown'::text
+        END AS category
+   FROM ((
+                 SELECT employees.id,
+                    employees.name,
+                    'employee'::text AS source_type
+                   FROM employees
+                  WHERE employees.status::text = 'active'::text
+                UNION
+                 SELECT departments.id,
+                    departments.name,
+                    'department'::text AS source_type
+                   FROM departments
+                  WHERE departments.manager_id IS NOT NULL
+        ) UNION ALL
+         SELECT employees.id,
+            COALESCE((employees.first_name::text || ' '::text) || employees.last_name::text, employees.name::text) AS name,
+            'employee_full'::text AS source_type
+           FROM employees
+          WHERE employees.priority > 10) combined_data
+  WHERE id IS NOT NULL
+  ORDER BY source_type, id;

testdata/diff/create_view/add_view/plan.txt

@@ -1,13 +1,14 @@
-Plan: 4 to add.
+Plan: 5 to add.
 
 Summary by type:
-  views: 4 to add
+  views: 5 to add
 
 Views:
   + array_operators_view
   + cte_with_case_view
   + nullif_functions_view
   + text_search_view
+  + union_subquery_view
 
 DDL to be executed:
 --------------------------------------------------
@@ -80,3 +81,33 @@ CREATE OR REPLACE VIEW text_search_view AS
     to_tsvector('english'::regconfig, (((COALESCE(first_name, ''::character varying)::text || ' '::text) || COALESCE(last_name, ''::character varying)::text) || ' '::text) || COALESCE(bio, ''::text)) AS search_vector
    FROM employees
   WHERE status::text = 'active'::text;
+
+CREATE OR REPLACE VIEW union_subquery_view AS
+ SELECT id,
+    name,
+    source_type,
+        CASE
+            WHEN source_type = 'employee'::text THEN 'active'::text
+            WHEN source_type = 'department'::text THEN 'organizational'::text
+            ELSE 'unknown'::text
+        END AS category
+   FROM ((
+                 SELECT employees.id,
+                    employees.name,
+                    'employee'::text AS source_type
+                   FROM employees
+                  WHERE employees.status::text = 'active'::text
+                UNION
+                 SELECT departments.id,
+                    departments.name,
+                    'department'::text AS source_type
+                   FROM departments
+                  WHERE departments.manager_id IS NOT NULL
+        ) UNION ALL
+         SELECT employees.id,
+            COALESCE((employees.first_name::text || ' '::text) || employees.last_name::text, employees.name::text) AS name,
+            'employee_full'::text AS source_type
+           FROM employees
+          WHERE employees.priority > 10) combined_data
+  WHERE id IS NOT NULL
+  ORDER BY source_type, id;