SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Identifier name
    Identifier value
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.settings
   Function like (children 1)
    ExpressionList (children 2)
     Identifier name
     Literal \'custom_%\'
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier name