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help / color / mirror / Atom feedFrom: Peter Smith <[email protected]>
To: Shlok Kyal <[email protected]>
Cc: shveta malik <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: vignesh C <[email protected]>
Cc: Zhijie Hou (Fujitsu) <[email protected]>
Cc: YeXiu <[email protected]>
Cc: Ian Lawrence Barwick <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Skipping schema changes in publication
Date: Wed, 24 Dec 2025 14:12:31 +1100
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Hi Shlok
Some review comments for patch v34-0001 (code)
======
src/backend/catalog/pg_publication.c
1.
+static List *
+get_publication_relations_internal(Oid pubid, PublicationPartOpt pub_partopt,
+ bool except_flag)
No need to name this function as "_internal"; the snake_case name and
static already indicate it is internal.
======
src/bin/pg_dump/pg_dump.c
getPublications:
2.
+ if (fout->remoteVersion >= 190000)
+ {
+ int ntbls;
+ PGresult *res_tbls;
+
+ resetPQExpBuffer(query);
+ appendPQExpBuffer(query,
+ "SELECT prrelid\n"
+ "FROM pg_catalog.pg_publication_rel\n"
+ "WHERE prpubid = %u and prexcept = true",
+ pubinfo[i].dobj.catId.oid);
+
+ res_tbls = ExecuteSqlQuery(fout, query->data, PGRES_TUPLES_OK);
+
+ ntbls = PQntuples(res_tbls);
+ if (ntbls == 0)
+ continue;
+
+ for (int j = 0; j < ntbls; j++)
+ {
+ Oid prrelid;
+ TableInfo *tbinfo;
+
+ prrelid = atooid(PQgetvalue(res_tbls, j, 0));
+
+ tbinfo = findTableByOid(prrelid);
+ if (tbinfo == NULL)
+ continue;
+
+ simple_ptr_list_append(&pubinfo[i].except_tables, tbinfo);
+ }
+
+ PQclear(res_tbls);
+ }
2a.
I suppose this code is for populating the list of all tables except
those excluded, but there is no explanatory comment stating the
purpose of all this.
~
2b.
BEFORE
"WHERE prpubid = %u and prexcept = true"
SUGGESTION
"WHERE prpubid = %u AND prexcept"
~~~
dumpPublication:
3.
+ {
+ bool first_tbl = true;
+
appendPQExpBufferStr(query, " FOR ALL TABLES");
+
+ /* Include exception tables if the publication has EXCEPT TABLEs */
+ for (SimplePtrListCell *cell = pubinfo->except_tables.head; cell;
cell = cell->next)
+ {
+ TableInfo *tbinfo = (TableInfo *) cell->ptr;
+
+ if (first_tbl)
+ {
+ appendPQExpBufferStr(query, " EXCEPT TABLE (");
+ first_tbl = false;
+ }
+ else
+ appendPQExpBufferStr(query, ", ");
+ appendPQExpBuffer(query, "ONLY %s", fmtQualifiedDumpable(tbinfo));
+ }
+ if (!first_tbl)
+ appendPQExpBufferStr(query, ")");
+ }
3a.
That code comment seems backwards.
BEFORE
/* Include exception tables if the publication has EXCEPT TABLEs */
SUGGESTION
/* Include EXCEPT TABLE clause if there are except_tables. */
~~~
3b.
Although it works OK, I felt the following looked strange:
+ if (!first_tbl)
+ appendPQExpBufferStr(query, ")");
IMO it would be better implemented as a counter:
Replace
bool first_tbl = true;
with
int n_excluded = 0;
Then,
+ if (first_tbl)
+ {
+ appendPQExpBufferStr(query, " EXCEPT TABLE (");
+ first_tbl = false;
+ }
becomes
+ if (++n_excluded == 1)
+ appendPQExpBufferStr(query, " EXCEPT TABLE (");
And,
+ if (!first_tbl)
+ appendPQExpBufferStr(query, ")");
becomes
+ if (n_excluded > 0)
+ appendPQExpBufferStr(query, ")");
======
src/bin/psql/describe.c
describeOneTableDetails:
4.
+ /* Print publication the relation is excluded explicitly */
+ if (pset.sversion >= 190000)
The comment doesn't seem right:
SUGGESTION
Print publications that the table is explicitly excluded from
======
src/test/regress/sql/publication.sql
5.
Missing tests.
There are no test cases to show that \d is working for printing the
"Except Publications:".
======
Kind Regards,
Peter Smith.
Fujitsu Australia.
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Subject: Re: Skipping schema changes in publication
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