chore: add NULLIF test case

testdata/diff/create_view/add_view/diff.sql

@@ -7,6 +7,24 @@ CREATE OR REPLACE VIEW array_operators_view AS
     CASE WHEN priority <> ANY (ARRAY[1, 2, 3]) THEN 'different' ELSE 'same' END AS not_equal_any_test
    FROM employees;
 
+CREATE OR REPLACE VIEW nullif_functions_view AS
+ SELECT e.id,
+    e.name AS employee_name,
+    d.name AS department_name,
+    (e.priority - d.manager_id) / NULLIF(d.manager_id, 0) AS priority_ratio,
+    NULLIF(e.status::text, 'inactive'::text) AS active_status,
+    NULLIF(e.email::text, ''::text) AS valid_email,
+    GREATEST(e.priority, 0) AS min_priority,
+    LEAST(e.priority, 100) AS max_priority,
+    GREATEST(e.id, d.id, e.department_id) AS max_id,
+        CASE
+            WHEN NULLIF(e.department_id, 0) IS NOT NULL THEN 'assigned'::text
+            ELSE 'unassigned'::text
+        END AS assignment_status
+   FROM employees e
+     JOIN departments d USING (id)
+  WHERE e.priority > 0;
+
 CREATE OR REPLACE VIEW text_search_view AS
  SELECT id,
     COALESCE((first_name::text || ' '::text) || last_name::text, 'Anonymous'::text) AS display_name,

testdata/diff/create_view/add_view/new.sql

@@ -37,4 +37,28 @@ SELECT
     COALESCE(bio, 'No description available') AS description,
     to_tsvector('english', COALESCE(first_name, '') || ' ' || COALESCE(last_name, '') || ' ' || COALESCE(bio, '')) AS search_vector
 FROM employees
-WHERE status = 'active';
+WHERE status = 'active';
+
+-- View testing NULLIF, GREATEST, LEAST, and joins (regression test for issue #103)
+CREATE VIEW public.nullif_functions_view AS
+SELECT
+    e.id,
+    e.name AS employee_name,
+    d.name AS department_name,
+    -- NULLIF to avoid divide-by-zero (main issue from #103)
+    (e.priority - d.manager_id) / NULLIF(d.manager_id, 0) AS priority_ratio,
+    -- Multiple NULLIF expressions
+    NULLIF(e.status, 'inactive') AS active_status,
+    NULLIF(e.email, '') AS valid_email,
+    -- GREATEST and LEAST functions
+    GREATEST(e.priority, 0) AS min_priority,
+    LEAST(e.priority, 100) AS max_priority,
+    GREATEST(e.id, d.id, e.department_id) AS max_id,
+    -- Complex CASE with NULLIF
+    CASE
+        WHEN NULLIF(e.department_id, 0) IS NOT NULL THEN 'assigned'
+        ELSE 'unassigned'
+    END AS assignment_status
+FROM employees e
+JOIN departments d USING (id)
+WHERE e.priority > 0;

testdata/diff/create_view/add_view/plan.json

@@ -14,6 +14,12 @@
           "operation": "create",
           "path": "public.array_operators_view"
         },
+        {
+          "sql": "CREATE OR REPLACE VIEW nullif_functions_view AS\n SELECT e.id,\n    e.name AS employee_name,\n    d.name AS department_name,\n    (e.priority - d.manager_id) / NULLIF(d.manager_id, 0) AS priority_ratio,\n    NULLIF(e.status::text, 'inactive'::text) AS active_status,\n    NULLIF(e.email::text, ''::text) AS valid_email,\n    GREATEST(e.priority, 0) AS min_priority,\n    LEAST(e.priority, 100) AS max_priority,\n    GREATEST(e.id, d.id, e.department_id) AS max_id,\n        CASE\n            WHEN NULLIF(e.department_id, 0) IS NOT NULL THEN 'assigned'::text\n            ELSE 'unassigned'::text\n        END AS assignment_status\n   FROM employees e\n     JOIN departments d USING (id)\n  WHERE e.priority > 0;",
+          "type": "view",
+          "operation": "create",
+          "path": "public.nullif_functions_view"
+        },
         {
           "sql": "CREATE OR REPLACE VIEW text_search_view AS\n SELECT id,\n    COALESCE((first_name::text || ' '::text) || last_name::text, 'Anonymous'::text) AS display_name,\n    COALESCE(email, ''::character varying) AS email,\n    COALESCE(bio, 'No description available'::text) AS description,\n    to_tsvector('english'::regconfig, (((COALESCE(first_name, ''::character varying)::text || ' '::text) || COALESCE(last_name, ''::character varying)::text) || ' '::text) || COALESCE(bio, ''::text)) AS search_vector\n   FROM employees\n  WHERE status::text = 'active'::text;",
           "type": "view",

testdata/diff/create_view/add_view/plan.sql

@@ -7,6 +7,24 @@ CREATE OR REPLACE VIEW array_operators_view AS
     CASE WHEN priority <> ANY (ARRAY[1, 2, 3]) THEN 'different' ELSE 'same' END AS not_equal_any_test
    FROM employees;
 
+CREATE OR REPLACE VIEW nullif_functions_view AS
+ SELECT e.id,
+    e.name AS employee_name,
+    d.name AS department_name,
+    (e.priority - d.manager_id) / NULLIF(d.manager_id, 0) AS priority_ratio,
+    NULLIF(e.status::text, 'inactive'::text) AS active_status,
+    NULLIF(e.email::text, ''::text) AS valid_email,
+    GREATEST(e.priority, 0) AS min_priority,
+    LEAST(e.priority, 100) AS max_priority,
+    GREATEST(e.id, d.id, e.department_id) AS max_id,
+        CASE
+            WHEN NULLIF(e.department_id, 0) IS NOT NULL THEN 'assigned'::text
+            ELSE 'unassigned'::text
+        END AS assignment_status
+   FROM employees e
+     JOIN departments d USING (id)
+  WHERE e.priority > 0;
+
 CREATE OR REPLACE VIEW text_search_view AS
  SELECT id,
     COALESCE((first_name::text || ' '::text) || last_name::text, 'Anonymous'::text) AS display_name,

testdata/diff/create_view/add_view/plan.txt

@@ -1,10 +1,11 @@
-Plan: 2 to add.
+Plan: 3 to add.
 
 Summary by type:
-  views: 2 to add
+  views: 3 to add
 
 Views:
   + array_operators_view
+  + nullif_functions_view
   + text_search_view
 
 DDL to be executed:
@@ -19,6 +20,24 @@ CREATE OR REPLACE VIEW array_operators_view AS
     CASE WHEN priority <> ANY (ARRAY[1, 2, 3]) THEN 'different' ELSE 'same' END AS not_equal_any_test
    FROM employees;
 
+CREATE OR REPLACE VIEW nullif_functions_view AS
+ SELECT e.id,
+    e.name AS employee_name,
+    d.name AS department_name,
+    (e.priority - d.manager_id) / NULLIF(d.manager_id, 0) AS priority_ratio,
+    NULLIF(e.status::text, 'inactive'::text) AS active_status,
+    NULLIF(e.email::text, ''::text) AS valid_email,
+    GREATEST(e.priority, 0) AS min_priority,
+    LEAST(e.priority, 100) AS max_priority,
+    GREATEST(e.id, d.id, e.department_id) AS max_id,
+        CASE
+            WHEN NULLIF(e.department_id, 0) IS NOT NULL THEN 'assigned'::text
+            ELSE 'unassigned'::text
+        END AS assignment_status
+   FROM employees e
+     JOIN departments d USING (id)
+  WHERE e.priority > 0;
+
 CREATE OR REPLACE VIEW text_search_view AS
  SELECT id,
     COALESCE((first_name::text || ' '::text) || last_name::text, 'Anonymous'::text) AS display_name,