SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function min (children 1)
     ExpressionList (children 1)
      Function tuple (children 1)
       ExpressionList (children 2)
        Identifier c1
        Identifier c2
    Function max (children 1)
     ExpressionList (children 1)
      Function tuple (children 1)
       ExpressionList (children 2)
        Identifier c1
        Identifier c2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function values (children 1)
       ExpressionList (children 3)
        Literal Tuple_(NULL, Float64_0)
        Literal Tuple_(Float64_0, Float64_0)
        Literal Tuple_(Float64_5, Float64_5)
