feat: 修改字段类型修改不生效的问题

src/test/java/com/codechecker/cache/diff/SchemaDifferTest.java

@@ -51,6 +51,57 @@ class SchemaDifferTest {
         assertEquals(1, changes.size());
         assertEquals(ChangeType.TYPE_CHANGED, changes.get(0).getChangeType());
         assertEquals(Severity.P0, changes.get(0).getSeverity());
+        assertTrue(changes.get(0).getMessage().contains("String"));
+        assertTrue(changes.get(0).getMessage().contains("Integer"));
+    }
+
+    @Test
+    void detectsBigDecimalToStringEvenWhenBothWereStringBucketHistorically() {
+        // 即便 JsonType 同为 STRING，javaType 变化也必须检出（用户真实漏报场景）
+        TypeSchema oldS = new TypeSchema("A");
+        oldS.add(new FieldSchema("amount", JsonType.STRING, "BigDecimal"));
+        TypeSchema newS = new TypeSchema("A");
+        newS.add(new FieldSchema("amount", JsonType.STRING, "String"));
+
+        List<SchemaChange> changes = new SchemaDiffer().diff(oldS, newS);
+        assertEquals(1, changes.size());
+        assertEquals(ChangeType.TYPE_CHANGED, changes.get(0).getChangeType());
+        assertEquals("amount", changes.get(0).getFieldPath());
+        assertTrue(changes.get(0).getOldValue().contains("BigDecimal"));
+        assertTrue(changes.get(0).getNewValue().contains("String"));
+    }
+
+    @Test
+    void detectsBigDecimalToStringViaJsonTypeAndJavaType() {
+        TypeSchema oldS = new TypeSchema("A");
+        oldS.add(new FieldSchema("amount", JsonType.NUMBER, "BigDecimal"));
+        TypeSchema newS = new TypeSchema("A");
+        newS.add(new FieldSchema("amount", JsonType.STRING, "String"));
+
+        List<SchemaChange> changes = new SchemaDiffer().diff(oldS, newS);
+        assertEquals(1, changes.size());
+        assertEquals(ChangeType.TYPE_CHANGED, changes.get(0).getChangeType());
+    }
+
+    @Test
+    void detectsIntegerToLongWithinNumberBucket() {
+        TypeSchema oldS = new TypeSchema("A");
+        oldS.add(new FieldSchema("id", JsonType.NUMBER, "Integer"));
+        TypeSchema newS = new TypeSchema("A");
+        newS.add(new FieldSchema("id", JsonType.NUMBER, "Long"));
+
+        List<SchemaChange> changes = new SchemaDiffer().diff(oldS, newS);
+        assertEquals(1, changes.size());
+        assertEquals(ChangeType.TYPE_CHANGED, changes.get(0).getChangeType());
+    }
+
+    @Test
+    void noChangeWhenPrimitiveAndWrapperEquivalent() {
+        TypeSchema a = new TypeSchema("A");
+        a.add(new FieldSchema("n", JsonType.NUMBER, "int"));
+        TypeSchema b = new TypeSchema("A");
+        b.add(new FieldSchema("n", JsonType.NUMBER, "Integer"));
+        assertTrue(new SchemaDiffer().diff(a, b).isEmpty());
     }
 
     @Test