code: def epoch_to_dttm(cls) -> str:
      return "DATETIMECONVERT({col}, '1:SECONDS:EPOCH', '1:SECONDS:EPOCH', '1:SECONDS')"
  
file_path: superset/superset/db_engine_specs/pinot.py
imports: from sqlalchemy import types
  from sqlalchemy.engine.interfaces import Dialect
  from sqlalchemy.types import TypeEngine
  from superset.constants import TimeGrain
  from superset.db_engine_specs.base import BaseEngineSpec
label_desc: Use image node_id 1 for calling the PinotEngineSpec obj's underlying member method code with example usage: obj.epoch_to_dttm(cls) and returns: str