SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Literal UInt64_1
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function mysql (children 1)
       ExpressionList (children 6)
        Literal \'127.0.0.1:9004\'
        Function currentDatabase (children 1)
         ExpressionList
        Identifier foo
        Literal \'default\'
        Literal \'\'
        Set
