SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function lambda (alias lambda_1) (children 1)
     ExpressionList (children 2)
      Function tuple (children 1)
       ExpressionList (children 1)
        Identifier x
      Function toString (children 1)
       ExpressionList (children 1)
        Identifier x
   ExpressionList (children 2)
    Function arrayMap (children 1)
     ExpressionList (children 2)
      Identifier lambda_1 (alias lambda_2)
      Literal Array_[UInt64_1, UInt64_2, UInt64_3]
    Function arrayMap (children 1)
     ExpressionList (children 2)
      Identifier lambda_2
      Literal Array_[\'1\', \'2\', \'3\']