SelectWithUnionQuery (children 3)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Subquery (alias res) (children 1)
     SelectWithUnionQuery (children 1)
      ExpressionList (children 1)
       SelectQuery (children 1)
        ExpressionList (children 1)
         Function sleepEachRow (children 1)
          ExpressionList (children 1)
           Literal UInt64_3
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.one
 Identifier Null
 Set
