class_docstr: This handler handles connection and execution of the PostgreSQL statements.
code: def get_columns(self, table_name: str) -> Response:
      query = f"""
              SELECT
                  column_name as "Field",
                  data_type as "Type"
              FROM
                  information_schema.columns
              WHERE
                  table_name = '{table_name}'
          """
      return self.native_query(query)
  
imports: from collections import OrderedDict
  import psycopg
  from psycopg.postgres import types
  from psycopg.pq import ExecStatus
  from pandas import DataFrame
  from mindsdb_sql import parse_sql
  from mindsdb_sql.render.sqlalchemy_render import SqlalchemyRender
  from mindsdb_sql.parser.ast.base import ASTNode
  from mindsdb.integrations.libs.base import DatabaseHandler
  from mindsdb.integrations.libs.const import HANDLER_CONNECTION_ARG_TYPE
  from mindsdb.utilities import log
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse, RESPONSE_TYPE
  import mindsdb.utilities.profiler
label_desc: Use image node_id 10 for calling the PostgresHandler obj's underlying member method code with example usage: obj.get_columns(table_name) and returns: self