Fix redshift schema ingest

Author: teraamp

data_diff/databases/redshift.py

@@ -181,7 +181,7 @@ def _normalize_schema_info(self, rows: Iterable[Tuple[Any]]) -> Dict[str, RawCol
 
             schema_dict[col_name] = RawColumnInfo(
                 column_name=col_name,
-                data_type=col_name,
+                data_type=base_type,
                 datetime_precision=None,
                 numeric_precision=precision,
                 numeric_scale=scale,