SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function less (children 1)
     ExpressionList (children 2)
      Function max (children 1)
       ExpressionList (children 1)
        Identifier bs
      Literal UInt64_70000
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 2)
           Function avg (children 1)
            ExpressionList (children 1)
             Identifier a
           Function max (alias bs) (children 1)
            ExpressionList (children 1)
             Function blockSize (children 1)
              ExpressionList
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function remote (children 1)
              ExpressionList (children 3)
               Identifier test_cluster_two_shards
               Function currentDatabase (children 1)
                ExpressionList
               Identifier t
          ExpressionList (children 1)
           Identifier a
