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From: shveta malik <shveta.malik@gmail.com>
Date: Wed, 28 Jan 2026 17:33:48 +0530
Message-ID: <CAJpy0uB6C6HfZcpDLFkywROGokdUZq0oX_EMhJz_gB17qaJmKw@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: Dilip Kumar <dilipbalaut@gmail.com>
Cc: Peter Smith <smithpb2250@gmail.com>, vignesh C <vignesh21@gmail.com>, 
	Amit Kapila <amit.kapila16@gmail.com>, Masahiko Sawada <sawada.mshk@gmail.com>, 
	Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>, 
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, shveta malik <shveta.malik@gmail.com>
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Precedence: bulk

On Tue, Jan 27, 2026 at 9:24=E2=80=AFAM Dilip Kumar <dilipbalaut@gmail.com>=
 wrote:
>
>
> Also fixed all pending doc comments.
>

Thanks for the patch, Please find a few comments:

patch0001:

1)
+/*
+ * GetLogDestination
+ *
+ * Convert string to enum by comparing against standardized labels.
+ */
+ConflictLogDest
+GetLogDestination(const char *dest)

IMO the name of the function should be GetConflictLogDest, otherwise
the current name might suggest it applies to all the logs related to
subscription, which is misleading.

2)
+ { .attname =3D "schemaname",       .atttypid =3D TEXTOID },

I checked the catalog tables known to me which refer to namespace, all
use namespace or nsp in their names, none use 'schema'. Examples:
pg_namespace, pg_class, pg_type. pg_constraint.  Shall we use nspname
instead?

<No issues found in my local testing for 0001>

~~

patch0002:

1)
conflict.c compiles without these:

+#include "utils/fmgroids.h"
+#include "utils/json.h"

2)
+ /*
+ * Get the conflict log destination. Also, (if there is one) return the
+ * CLT relation already opened and ready for insertion.
+ */
+ conflictlogrel =3D GetConflictLogDestAndTable(&dest);

'CLT relation' means conflict log table relation. Shall we correct it
to mention either table alone or relation alone?

3)
This is defined in conflict.h:

+/* The single source of truth for the conflict log table schema */
+static const ConflictLogColumnDef ConflictLogSchema[] =3D
+{
....
+ { .attname =3D "local_conflicts",  .atttypid =3D JSONARRAYOID }
+};

while its element 'local_conflicts' is defined in conflict.c:

+/* Schema for the elements within the 'local_conflicts' JSON array */
+static const ConflictLogColumnDef LocalConflictSchema[] =3D
+{
...
+};

It takes some time to figure this part out as a reader of code. I
think we shall define LocalConflictSchema schema immediately after
ConflictLogSchema for anyone to understand it better, unless there is
something blocking it?

4)
+# Verify that '2' is present inside the JSON structure using a regex
+# This matches the key/value pattern for "a": 2
+like($raw_json, qr/\\"a\\":2/, 'Verified that key 2 exists in the
local_conflicts');
+

Reviewing further. Testing of 0002 yet to be finished.

thanks
Shveta