sql.py: DbConn.col_info(): Fixed bug where need to use .to_str(self) instead of self.esc_value() because self.esc_value() expects a value, not a sql_gen.Literal instance
sql.py: DbConn.col_info(): Fixed bug where need to use .to_str(self) instead of self.esc_value() because self.esc_value() expects a value, not a sql_gen.Literal instance