Explain EXPLAIN (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 3)
           ExpressionList (children 2)
            Identifier x
            Function sum (children 1)
             ExpressionList (children 1)
              Identifier y
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              Function remote (children 1)
               ExpressionList (children 3)
                Literal \'127.0.0.{1,2}\'
                Function currentDatabase (children 1)
                 ExpressionList
                Identifier tab
           ExpressionList (children 1)
            Identifier x
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal UInt64_42
