fix more tests

Author: sdebruyn

dbt/adapters/sqlserver/sql_server_column.py

@@ -1,4 +1,4 @@
-from typing import ClassVar, Dict
+from typing import Any, ClassVar, Dict
 
 from dbt.adapters.base import Column
 
@@ -11,3 +11,10 @@ class SQLServerColumn(Column):
         "INTEGER": "INT",
         "BOOLEAN": "BIT",
     }
+
+    @classmethod
+    def string_type(cls, size: int) -> str:
+        return f"varchar({size if size > 0 else 'MAX'})"
+
+    def literal(self, value: Any) -> str:
+        return "cast('{}' as {})".format(value, self.data_type)

dbt/include/sqlserver/macros/adapters/columns.sql

@@ -55,3 +55,18 @@
   {%- endcall -%}
 
 {% endmacro %}
+
+
+{% macro sqlserver__alter_relation_add_remove_columns(relation, add_columns, remove_columns) %}
+  {% call statement('add_drop_columns') -%}
+    {% if add_columns %}
+        alter {{ relation.type }} {{ relation }}
+        add {% for column in add_columns %}{{ column.name }} {{ column.data_type }}{{ ', ' if not loop.last }}{% endfor %};
+    {% endif %}
+
+    {% if remove_columns %}
+        alter {{ relation.type }} {{ relation }}
+        drop column {% for column in remove_columns %}{{ column.name }}{{ ',' if not loop.last }}{% endfor %};
+    {% endif %}
+  {%- endcall -%}
+{% endmacro %}