SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function clusterAllReplicas (children 1)
       ExpressionList (children 3)
        Literal \'test_cluster_two_shard_three_replicas_localhost\'
        Function currentDatabase (children 1)
         ExpressionList
        Identifier tt
   Set
