SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Literal UInt64_1
   Function in (children 1)
    ExpressionList (children 2)
     Function lambda (children 1)
      ExpressionList (children 2)
       Function tuple (children 1)
        ExpressionList (children 1)
         Identifier y
       Literal UInt64_1
     Function tuple (children 1)
      ExpressionList (children 2)
       Function materialize (children 1)
        ExpressionList (children 1)
         Literal UInt64_1
       Literal UInt64_1
