Correct syntax for mv comments (#853)

* correct syntax for mv comments
* add test and changie

---------

Co-authored-by: Colin Rogers <[email protected]>
Co-authored-by: Mike Alfare <[email protected]>
(cherry picked from commit 08e50f9)

.changes/unreleased/Fixes-20240715-143507.yaml

@@ -0,0 +1,6 @@
+kind: Fixes
+body: Fix materialized views comment syntax
+time: 2024-07-15T14:35:07.412274+12:00
+custom:
+    Author: jeremyyeo
+    Issue: "837"

dbt/include/redshift/macros/adapters.sql

@@ -276,9 +276,24 @@
   {% endif %}
 {% endmacro %}
 
+{#
+  Copied from the postgres-adapter.
+#}
+{% macro escape_comment(comment) -%}
+  {% if comment is not string %}
+    {% do exceptions.raise_compiler_error('cannot escape a non-string: ' ~ comment) %}
+  {% endif %}
+  {%- set magic = '$dbt_comment_literal_block$' -%}
+  {%- if magic in comment -%}
+    {%- do exceptions.raise_compiler_error('The string ' ~ magic ~ ' is not allowed in comments.') -%}
+  {%- endif -%}
+  {{ magic }}{{ comment }}{{ magic }}
+{%- endmacro %}
 
 {% macro redshift__alter_relation_comment(relation, comment) %}
-  {% do return(postgres__alter_relation_comment(relation, comment)) %}
+  {%- set escaped_comment = escape_comment(comment) -%}
+  {%- set relation_type = 'view' if relation.type == 'materialized_view' else relation.type -%}
+  comment on {{ relation_type }} {{ relation }} is {{ escaped_comment }};
 {% endmacro %}
 
 

tests/functional/adapter/test_persist_docs.py

@@ -1,6 +1,7 @@
 import json
 import pytest
 
+from dbt.tests.adapter.materialized_view import files
 from dbt.tests.util import run_dbt
 
 from dbt.tests.adapter.persist_docs.test_persist_docs import (
@@ -10,6 +11,21 @@
     BasePersistDocsCommentOnQuotedColumn,
 )
 
+_MATERIALIZED_VIEW_PROPERTIES__SCHEMA_YML = """
+version: 2
+models:
+  - name: my_materialized_view
+    description: |
+      Materialized view model description "with double quotes"
+      and with 'single  quotes' as welll as other;
+      '''abc123'''
+      reserved -- characters
+      80% of statistics are made up on the spot
+      --
+      /* comment */
+      Some $lbl$ labeled $lbl$ and $$ unlabeled $$ dollar-quoting
+"""
+
 
 class TestPersistDocs(BasePersistDocs):
     @pytest.mark.flaky
@@ -62,3 +78,31 @@ def test_comment_on_late_binding_view(self, project):
 
         no_docs_node = catalog_data["nodes"]["model.test.no_docs_model"]
         self._assert_has_view_comments(no_docs_node, False, False)
+
+
+class TestPersistDocsWithMaterializedView(BasePersistDocs):
+    @pytest.fixture(scope="class", autouse=True)
+    def seeds(self):
+        return {"my_seed.csv": files.MY_SEED}
+
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "my_materialized_view.sql": files.MY_MATERIALIZED_VIEW,
+        }
+
+    @pytest.fixture(scope="class")
+    def properties(self):
+        return {
+            "schema.yml": _MATERIALIZED_VIEW_PROPERTIES__SCHEMA_YML,
+        }
+
+    @pytest.mark.flaky
+    def test_has_comments_pglike(self, project):
+        run_dbt(["docs", "generate"])
+        with open("target/catalog.json") as fp:
+            catalog_data = json.load(fp)
+        assert "nodes" in catalog_data
+        assert len(catalog_data["nodes"]) == 2
+        view_node = catalog_data["nodes"]["model.test.my_materialized_view"]
+        assert view_node["metadata"]["comment"].startswith("Materialized view model description")