feat: Add BaseDAO improvements and test reorganization (#35018)

Co-authored-by: bito-code-review[bot] <188872107+bito-code-review[bot]@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

superset/daos/dataset.py

@@ -18,7 +18,7 @@ from __future__ import annotations
 
 import logging
 from datetime import datetime
-from typing import Any
+from typing import Any, Dict, List
 
 import dateutil.parser
 from sqlalchemy.exc import SQLAlchemyError
@@ -35,8 +35,18 @@ from superset.views.base import DatasourceFilter
 
 logger = logging.getLogger(__name__)
 
+# Custom filterable fields for datasets
+DATASET_CUSTOM_FIELDS: dict[str, list[str]] = {}
+
 
 class DatasetDAO(BaseDAO[SqlaTable]):
+    """
+    DAO for datasets. Supports filtering on model fields, hybrid properties, and custom
+    fields:
+    - tags: list of tags (eq, in_, like)
+    - owner: user id (eq, in_)
+    """
+
     base_filter = DatasourceFilter
 
     @staticmethod
@@ -351,6 +361,13 @@ class DatasetDAO(BaseDAO[SqlaTable]):
             .one_or_none()
         )
 
+    @classmethod
+    def get_filterable_columns_and_operators(cls) -> Dict[str, List[str]]:
+        filterable = super().get_filterable_columns_and_operators()
+        # Add custom fields
+        filterable.update(DATASET_CUSTOM_FIELDS)
+        return filterable
+
 
 class DatasetColumnDAO(BaseDAO[TableColumn]):
     pass