docstr: Check connection to the handler.
  Returns:
      DBHandlerStatus
docstr_tok: ["Check","connection","to","the","handler",".","Returns",":","DBHandlerStatus"]
code: def check_connection(self) -> DBHandlerStatus:
      """
      Check connection to the handler.
      Returns:
          DBHandlerStatus
      """
      if self.connection:
          return DBHandlerStatus(status=True)
      else:
          return DBHandlerStatus(
              status=False, error="Not connected to the database."
          )
  
file_path: evadb/evadb/third_party/databases/clickhouse/clickhouse_handler.py
imports: import pandas
  from sqlalchemy import create_engine
  from evadb.third_party.databases.types import DBHandler, DBHandlerResponse, DBHandlerStatus
label_desc: Use image node_id 4 for calling the ClickHouseHandler obj's underlying member method code with example usage: obj.check_connection() and returns: DBHandlerStatus, DBHandlerStatus