Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 4)
     Function sum (children 1)
      ExpressionList (children 1)
       Function plus (children 1)
        ExpressionList (children 2)
         Function abs (children 1)
          ExpressionList (children 1)
           Identifier n
         Literal UInt64_1
     Function sum (children 1)
      ExpressionList (children 1)
       Function plus (children 1)
        ExpressionList (children 2)
         Function abs (children 1)
          ExpressionList (children 1)
           Identifier n
         Identifier n
     Function sum (children 1)
      ExpressionList (children 1)
       Function minus (children 1)
        ExpressionList (children 2)
         Identifier n
         Function abs (children 1)
          ExpressionList (children 1)
           Identifier n
     Function sum (children 1)
      ExpressionList (children 1)
       Function minus (children 1)
        ExpressionList (children 2)
         Literal UInt64_1
         Function abs (children 1)
          ExpressionList (children 1)
           Identifier n
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 2)
           ExpressionList (children 1)
            Identifier number (alias n)
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              Function numbers (children 1)
               ExpressionList (children 1)
                Literal UInt64_10
