test(oracle): schema-check boolean coverage + portable rows_tested_query

- Add an Oracle-gated schema-check test asserting a `data_type: boolean`
  contract passes (pre-23ai stores BOOLEAN as NUMBER; 23ai native).
- Route the rows_tested_query `SELECT NULL` case through select_literal_query
  (adds FROM DUAL on Oracle), consistent with the other constant queries.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Niels-b

soda-tests/tests/integration/test_failed_rows_rows_tested_query.py

@@ -270,7 +270,7 @@ def test_failed_rows_rows_tested_query_returns_null(data_source_test_helper: Dat
                     FROM {test_table.qualified_name}
                     WHERE ({end_quoted} - {start_quoted}) > 5
                   rows_tested_query: |
-                    SELECT NULL
+                    {data_source_test_helper.select_literal_query("NULL")}
         """,
     )
 

soda-tests/tests/integration/test_schema_check.py

@@ -19,6 +19,42 @@
     .build()
 )
 
+_boolean_schema_test_table_specification = (
+    TestTableSpecification.builder()
+    .table_purpose("schema_boolean")
+    .column_varchar("id")
+    .column_boolean("is_active")
+    .build()
+)
+
+
+def test_schema_boolean_data_type_oracle(data_source_test_helper: DataSourceTestHelper):
+    """A contract declaring ``data_type: boolean`` must pass the schema check on Oracle, including
+    pre-23ai (18c/19c) where BOOLEAN has no native SQL type and is stored as NUMBER (which reads
+    back as ``number``). Guarded by OracleSqlDialect.data_type_names_are_same_or_synonym."""
+    if data_source_test_helper.data_source_impl.type_name != "oracle":
+        pytest.skip("Oracle-specific: pre-23ai Oracle stores BOOLEAN as NUMBER")
+
+    test_table = data_source_test_helper.ensure_test_table(_boolean_schema_test_table_specification)
+
+    data_source_test_helper.enable_soda_cloud_mock(
+        [
+            MockResponse(status_code=200, json_object={"fileId": "a81bc81b-dead-4e5d-abff-90865d1e13b1"}),
+        ]
+    )
+
+    data_source_test_helper.assert_contract_pass(
+        test_table=test_table,
+        contract_yaml_str=f"""
+            checks:
+              - schema:
+            columns:
+              - name: id
+              - name: is_active
+                data_type: boolean
+        """,
+    )
+
 
 @pytest.mark.parametrize("table_type", [TableType.TABLE, TableType.MATERIALIZED_VIEW, TableType.VIEW])
 def test_schema(data_source_test_helper: DataSourceTestHelper, table_type: TableType):