SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function groupNumericIndexedVector (children 1)
     ExpressionList (children 2)
      Identifier x
      Identifier y
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function values (children 1)
       ExpressionList (children 6)
        Literal \'x Nullable(Int32), y Nullable(Float64)\'
        Literal Tuple_(UInt64_1, UInt64_0)
        Literal Tuple_(UInt64_3, Float64_inf)
        Literal Tuple_(UInt64_3, UInt64_2)
        Literal Tuple_(UInt64_0, UInt64_0)
        Literal Tuple_(UInt64_5, UInt64_1)
