Fix: Include column types in Databricks materialized views with comments

  Databricks requires column types to be specified when adding column
  comments in CREATE MATERIALIZED VIEW statements. Without the column
  types, the comments are silently ignored.

  This change adds a Databricks-specific override of _build_column_defs
  that forces column types to be included when creating views with column
  descriptions.

Author: afredojala

sqlmesh/core/engine_adapter/databricks.py

@@ -394,3 +394,19 @@ def _build_table_properties_exp(
             expressions.append(clustered_by_exp)
             properties = exp.Properties(expressions=expressions)
         return properties
+
+    def _build_column_defs(
+        self,
+        target_columns_to_types: t.Dict[str, exp.DataType],
+        column_descriptions: t.Optional[t.Dict[str, str]] = None,
+        is_view: bool = False,
+    ) -> t.List[exp.ColumnDef]:
+        # Databricks requires column types to be specified when adding column comments
+        # in CREATE MATERIALIZED VIEW statements. Override is_view to False to force
+        # column types to be included when comments are present.
+        if is_view and column_descriptions:
+            engine_supports_schema_comments = self.COMMENT_CREATION_VIEW.supports_schema_def
+            if engine_supports_schema_comments and self.comments_enabled:
+                is_view = False
+
+        return super()._build_column_defs(target_columns_to_types, column_descriptions, is_view)