SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 2)
    Identifier y
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function cluster (children 1)
       ExpressionList (children 3)
        Identifier test_cluster_1_shard_3_replicas_1_unavailable
        Function currentDatabase (children 1)
         ExpressionList
        Identifier 02918_parallel_replicas
   ExpressionList (children 1)
    Identifier y
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier y
   Set
