PR feedback - add comment with example

src/connector_postgres_v2/base_command.py

@@ -66,6 +66,12 @@ def handler(conn: Any, cursor: Any) -> None:
 
     def fetchall(self, sql: str, conn_str: str, values: list) -> ConnectorProxyResponseDict:
         def prep_results(results: list) -> list:
+            # takes the raw results which is a list of a single item list of strings that
+            # look like tuples with embedded quotes:
+            # - [["(1,\"some vendor\")"], ["(2,\"another vendor\")"]]
+            # and turns it into a list of lists of strings that represent the data for each
+            # column. this way the individual values can be accessed directly from task data.
+            # - [["1", "some vender"], ["2", "another_vendor"]]
             return [r[0][1:-1].replace('"', '').split(",") for r in results]
         def handler(conn: Any, cursor: Any) -> list:
             cursor.execute(sql, values)