v1.1.0 fixes

- Added a custom test case to test the macro alter_column_datatype
- Fixed alter_column_datatype macro; DROP column was missing constraints keyword after CASCADE

Author: aosingh

dbt/include/oracle/macros/adapters.sql

@@ -240,7 +240,7 @@
     update {{ relation.include(False, True, True).quote(schema=False, identifier=False)  }} set {{ tmp_column }} = {{ column_name }}
   {% endcall %}
   {% call statement('alter_column_type 3', fetch_result=False) %}
-    alter table {{ relation.include(False, True, True).quote(schema=False, identifier=False) }} drop column {{ column_name }} cascade
+    alter table {{ relation.include(False, True, True).quote(schema=False, identifier=False) }} drop column {{ column_name }} cascade constraints
   {% endcall %}
   {% call statement('alter_column_type 4', fetch_result=False) %}
     alter table {{ relation.include(False, True, True).quote(schema=False, identifier=False) }} rename column {{ tmp_column }} to {{ column_name }}

tests/functional/adapter/macros/__init__.py

@@ -0,0 +1,67 @@
+import pytest
+from dbt.tests.util import run_dbt, get_relation_columns
+
+# seeds/my_seed.csv
+my_seed_csv = """
+id,name,some_date
+1,Easton,1981-05-20T06:46:51
+2,Lillian,1978-09-03T18:10:33
+3,Jeremiah,1982-03-11T03:59:51
+4,Nolan,1976-05-06T20:21:35
+""".lstrip()
+
+# models/my_model.sql
+my_model_sql = """
+{{config(materialized='table')}}
+select * from {{ ref('my_seed') }}
+"""
+
+# wrapper macro which calls the alter_column_type macro
+alter_column_type_wrapper_macro = """
+{% macro wrap_alter_column_type() %}
+    {%- set relation = adapter.get_relation(database=target.database, schema=schema, identifier='my_model') -%}
+    {{ return(adapter.dispatch('alter_column_type')(relation, 'name', 'CLOB')) }}
+{% endmacro %}
+"""
+
+
+class TestAlterColumnDataTypeMacro:
+    """
+    Tests the macro `oracle__alter_column_type`
+
+    """
+
+    @pytest.fixture(scope="class")
+    def seeds(self):
+        return {
+            "my_seed.csv": my_seed_csv,
+        }
+
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "my_model.sql": my_model_sql,
+        }
+
+    @pytest.fixture(scope="class")
+    def macros(self):
+        return {"wrap_alter_column_type.sql": alter_column_type_wrapper_macro}
+
+    def test_run_macro(self, project):
+        """seed, then run, then macro to alter table column datatype
+
+        """
+        results = run_dbt(['seed'])
+        assert len(results) == 1
+
+        results = run_dbt(['run'])
+        assert len(results) == 1
+
+        run_dbt(['run-operation', 'wrap_alter_column_type'])
+        columns = get_relation_columns(project.adapter, 'my_model')
+        expected_columns = [('ID', 'NUMBER', 0),
+                            ('NAME', 'CLOB', 0),
+                            ('SOME_DATE', 'TIMESTAMP(6)', 0)]
+        assert expected_columns == columns
+
+