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Improve subscriber's error message for wrong publication relkind.

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Pre-v13 versions only support logical replication from plain tables,
while v13 and later also allow partitioned tables to be published.
If you tried to subscribe an older server to such a publication,
you got "table XXX not found on publisher", which is pretty
unhelpful/confusing.  Arrange to deliver a more on-point error
message.  As commit c314c147c did in v13, remove the relkind check
from the query WHERE clause altogether, so that "not there"
is distinguishable from "wrong relkind".

Per report from Radoslav Nedyalkov.  Patch v10-v12.

Discussion: https://postgr.es/m/2952568.1644876730@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2022-02-15 12:21:28 -05:00
parent ce349cf176
commit e16db75dd6
1 changed files with 17 additions and 4 deletions
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21
src/backend/replication/logical/tablesync.c
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@ -646,9 +646,10 @@ fetch_remote_table_info(char *nspname, char *relname,
WalRcvExecResult *res;
StringInfoData cmd;
TupleTableSlot *slot;
Oid tableRow[2] = {OIDOID, CHAROID};
Oid tableRow[3] = {OIDOID, CHAROID, CHAROID};
Oid attrRow[4] = {TEXTOID, OIDOID, INT4OID, BOOLOID};
bool isnull;
char relkind;
int natt;
lrel->nspname = nspname;
@ -656,13 +657,12 @@ fetch_remote_table_info(char *nspname, char *relname,
/* First fetch Oid and replica identity. */
initStringInfo(&cmd);
appendStringInfo(&cmd, "SELECT c.oid, c.relreplident"
appendStringInfo(&cmd, "SELECT c.oid, c.relreplident, c.relkind"
" FROM pg_catalog.pg_class c"
" INNER JOIN pg_catalog.pg_namespace n"
" ON (c.relnamespace = n.oid)"
" WHERE n.nspname = %s"
" AND c.relname = %s"
" AND c.relkind = 'r'",
" AND c.relname = %s",
quote_literal_cstr(nspname),
quote_literal_cstr(relname));
res = walrcv_exec(LogRepWorkerWalRcvConn, cmd.data,
@ -683,6 +683,19 @@ fetch_remote_table_info(char *nspname, char *relname,
Assert(!isnull);
lrel->replident = DatumGetChar(slot_getattr(slot, 2, &isnull));
Assert(!isnull);
relkind = DatumGetChar(slot_getattr(slot, 3, &isnull));
Assert(!isnull);
/*
* Newer PG versions allow things that aren't plain tables to appear in
* publications. We don't handle that in this version, but try to provide
* a useful error message.
*/
if (relkind != RELKIND_RELATION)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("logical replication source relation \"%s.%s\" is not a table",
nspname, relname)));
ExecDropSingleTupleTableSlot(slot);
walrcv_clear_result(res);