SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function dictGet (children 1)
     ExpressionList (children 3)
      Literal \'executable_pool_simple\'
      Literal \'a\'
      Function toUInt64 (children 1)
       ExpressionList (children 1)
        Literal UInt64_1