Add custom error for view column masks

Author: ericj-db

dbt/include/databricks/macros/relations/view/create.sql

@@ -1,4 +1,10 @@
 {% macro databricks__create_view_as(relation, sql) %}
+  {# Column masks result in silent failure for views, so throw custom compiler error #}
+  {% for column_name, column in model.columns.items() %}
+    {% if column is mapping and column.get('column_mask') %}
+      {% do exceptions.raise_compiler_error("Column masks are not supported for views. Column '" ~ column_name ~ "' has a mask defined.") %}
+    {% endif %}
+  {% endfor %}
   {{ log("Creating view " ~ relation) }}
   create or replace view {{ relation.render() }}
   {%- if config.persist_column_docs() -%}

tests/functional/adapter/column_masks/test_column_mask.py

@@ -51,3 +51,16 @@ def models(self):
             "base_model.sql": base_model_sql.replace("table", "incremental"),
             "schema.yml": model,
         }
+
+
+class TestViewColumnMaskFailure(MaterializationV2Mixin):
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "base_model.sql": base_model_sql.replace("table", "view"),
+            "schema.yml": model,
+        }
+
+    def test_view_column_mask_failure(self, project):
+        result = run_dbt(["run"], expect_pass=False)
+        assert "Column masks are not supported for views" in result.results[0].message