remove complex type conversion

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

src/databricks/sql/result_set.py

@@ -600,43 +600,6 @@ def fetchall_json(self) -> List:
 
         return results
 
-    def _convert_complex_types_to_string(
-        self, rows: "pyarrow.Table"
-    ) -> "pyarrow.Table":
-        """
-        Convert complex types (array, struct, map) to string representation.
-
-        Args:
-            rows: Input PyArrow table
-
-        Returns:
-            PyArrow table with complex types converted to strings
-        """
-
-        if not pyarrow:
-            return rows
-
-        def convert_complex_column_to_string(col: "pyarrow.Array") -> "pyarrow.Array":
-            python_values = col.to_pylist()
-            json_strings = [
-                (None if val is None else json.dumps(val)) for val in python_values
-            ]
-            return pyarrow.array(json_strings, type=pyarrow.string())
-
-        converted_columns = []
-        for col in rows.columns:
-            converted_col = col
-            if (
-                pyarrow.types.is_list(col.type)
-                or pyarrow.types.is_large_list(col.type)
-                or pyarrow.types.is_struct(col.type)
-                or pyarrow.types.is_map(col.type)
-            ):
-                converted_col = convert_complex_column_to_string(col)
-            converted_columns.append(converted_col)
-
-        return pyarrow.Table.from_arrays(converted_columns, names=rows.column_names)
-
     def fetchmany_arrow(self, size: int) -> "pyarrow.Table":
         """
         Fetch the next set of rows as an Arrow table.
@@ -662,9 +625,6 @@ def fetchmany_arrow(self, size: int) -> "pyarrow.Table":
         results = self._convert_json_to_arrow(rows)
         self._next_row_index += results.num_rows
 
-        if not self.backend._use_arrow_native_complex_types:
-            results = self._convert_complex_types_to_string(results)
-
         return results
 
     def fetchall_arrow(self) -> "pyarrow.Table":
@@ -679,9 +639,6 @@ def fetchall_arrow(self) -> "pyarrow.Table":
         results = self._convert_json_to_arrow(rows)
         self._next_row_index += results.num_rows
 
-        if not self.backend._use_arrow_native_complex_types:
-            results = self._convert_complex_types_to_string(results)
-
         return results
 
     def fetchone(self) -> Optional[Row]: