SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function byteSize (alias x) (children 1)
     ExpressionList (children 2)
      Literal UInt64_123
      Literal Float64_456.7
    Function isConstant (children 1)
     ExpressionList (children 1)
      Identifier x
