class_docstr: Merge the seq scan queries
  Arguments:
      node (AbstractPlan): The UnionPlan
code: def __init__(self, db: EvaDBDatabase, node: UnionPlan):
      super().__init__(db, node)
  
file_path: evadb/evadb/executor/union_executor.py
imports: from typing import Iterator
  from evadb.database import EvaDBDatabase
  from evadb.executor.abstract_executor import AbstractExecutor
  from evadb.models.storage.batch import Batch
  from evadb.plan_nodes.union_plan import UnionPlan
label_desc: Use image node_id 1 to create a new UnionExecutor object from inherited base classes: AbstractExecutor with example: obj = UnionExecutor(db, node)