SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function dictGet (children 1)
     ExpressionList (children 3)
      Literal \'executable_pool_complex\'
      Literal \'a\'
      Literal Tuple_(\'First_1\', \'Second_1\')