SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Literal Tuple_(UInt64_1, UInt64_2) (alias a)
   ExpressionList (children 2)
    Function in (children 1)
     ExpressionList (children 2)
      Literal UInt64_1
      Identifier a
    Function in (children 1)
     ExpressionList (children 2)
      Literal UInt64_3
      Identifier a