Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jKC4T-00028p-4c for pgsql-hackers@arkaria.postgresql.org; Fri, 03 Apr 2020 02:28:37 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1jKC4R-0000QC-Up for pgsql-hackers@arkaria.postgresql.org; Fri, 03 Apr 2020 02:28:35 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jKC4R-0000Nz-CJ for pgsql-hackers@lists.postgresql.org; Fri, 03 Apr 2020 02:28:35 +0000 Received: from sender4-op-o13.zoho.com ([136.143.188.13]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.92) (envelope-from ) id 1jKC4K-0006Ei-8s for pgsql-hackers@lists.postgresql.org; Fri, 03 Apr 2020 02:28:34 +0000 ARC-Seal: i=1; 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b=M4NWatMoVxp8arl99Bj397xFpH631IwbdXtCo2p4ARg4y3TdU/FZAKw37js7ko1f jM2oez/39y8tAR4+TtOlmYO8gqVrQVMbUspx4wEMeqMsXjp7tKEvha/4FzTqe08PgSO /0UqrC3oOp4oWi4lFkjtBH4YNMiSQ3d5upvc6NV0= Received: from lchch (124.133.18.218 [124.133.18.218]) by mx.zohomail.com with SMTPS id 1585880898283834.0677922175622; Thu, 2 Apr 2020 19:28:18 -0700 (PDT) Date: Fri, 3 Apr 2020 10:28:15 +0800 From: "movead.li@highgo.ca" To: "Daniel Verite" Cc: "Tom Lane" , ashutosh.bapat , pgsql-hackers Subject: Re: A bug when use get_bit() function for a long bytea string References: <84525289-3891-4368-9157-5452f53a6908@manitou-mail.org> X-Priority: 3 X-GUID: 155FABDA-BB69-4BBA-8A31-4A0AA970D23D X-Has-Attach: yes X-Mailer: Foxmail 7.2.14.410[cn] Mime-Version: 1.0 Message-ID: <2020040310281100220146@highgo.ca> Content-Type: multipart/mixed; boundary="----=_001_NextPart343563775455_=----" X-Zoho-Virus-Status: 2 X-ZohoMailClient: External List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk This is a multi-part message in MIME format. ------=_001_NextPart343563775455_=---- Content-Type: multipart/alternative; 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&= gt;Some comments about the set_bit/get_bit parts.
>I'm reading long_bytea_string_bug_fix_ver6_pg10.patch, but t= hat
>applies probably to the other files mea= nt for the existing releases
>(I think you c= ould get away with only one patch for backpatching
&= gt;and one patch for v13, and committers will sort out how
>to deal with release branches).
Thanks fo= r teaching me.

>byteaSetBit(PG_FUNCTION_ARGS)<= /div>
>{
>bytea &nbs= p;  *res =3D PG_GETARG_BYTEA_P_COPY(0);
>- int32 n =3D PG_GETARG_INT32(1);
>+ int64= n =3D PG_GETARG_INT64(1);
>int32 newBit =3D= PG_GETARG_INT32(2);
>The 2nd argument is 32= -bit, not 64. PG_GETARG_INT32(1) must be used. 
>+ errmsg("index "INT64_FORMAT" out of valid ran= ge, 0.."INT64_FORMAT,
>+ n, (int64)len * 8 -= 1)));
>The cast to int64 avoids the overflo= w, but it may also produce a
>result that do= es not reflect the actual range, which is limited to
&= gt;2^31-1, again because the bit number is a signed 32-bit value. 
>I believe the formula= for the upper limit in the 32-bit case is:
>  (len <=3D PG_INT32_MAX / 8) ? (len*8 - 1) : PG_INT32_MAX;
=

>These functions could benefi= t from a comment mentioning that
>they canno= t reach the full extent of a bytea, because of the size limit
>on the bit number.

= Because the 2nd argument is describing 'bit' location of every byte in byt= ea
string, so an int32 is not enough for that. I think the chang= e is nothing wrong,
or I have not caught your means? 
=


>These 2 tests need to allocat= e big chunks of contiguous memory, so they
>= might fail for lack of memory on tiny machines, and even when not failing,=
>they're pretty slow to run. Are they worth= the trouble?


>These 2 tests are supposed to fail in existing releases because set_bit()=
>and get_bit() don't take a bigint as the 2= nd argument.
>Also, the same comment as abov= e on how much they allocate.
I have deleted the four test = cases because it is not worth the memory and time,
and no new te= st cases added because it needs time to generate lots of data.
<= br>
New patch attached.
=0A

=0A
Regards,
Highg= o Software (Canada/China/Pakistan)
URL : www.highgo.ca
EMAIL: = mailto:movead(dot)li(at)highgo(dot)ca
= =0A
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