inconsistent debug log output

Dave E Martin (xxiii(at)cyberdude(dot)com) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
inconsistent debug log output

Long Description
a transaction from psql shows referential integrity statements in the output, but a transaction from a client using libpq does not; they are both using the same backend, PGDEBUG=2:

<PRE>
libpq:
000829.20:05:17.179 [2521] StartTransactionCommand
000829.20:05:17.180 [2521] query: INSERT INTO NAS (...) VALUES (...)
000829.20:05:17.180 [2521] ProcessQuery
000829.20:05:17.182 [2521] CommitTransactionCommand
000829.20:05:17.182 [2521] StartTransactionCommand
000829.20:05:17.182 [2521] query: COMMIT
000829.20:05:17.182 [2521] ProcessUtility: COMMIT
000829.20:05:17.182 [2521] CommitTransactionCommand
000829.20:05:17.183 [2521] ERROR: nas_make: Permission denied.
000829.20:05:17.183 [2521] AbortCurrentTransaction

psql:
000829.23:18:08.413 [2542] StartTransactionCommand
000829.23:18:08.413 [2542] query: INSERT INTO NAS (...) VALUES (...);
000829.23:18:08.414 [2542] ProcessQuery
000829.23:18:08.417 [2542] CommitTransactionCommand
000829.23:18:46.444 [2542] StartTransactionCommand
000829.23:18:46.444 [2542] query: commit;
000829.23:18:46.444 [2542] ProcessUtility: commit;
000829.23:18:46.444 [2542] CommitTransactionCommand
000829.23:18:46.446 [2542] query: SELECT oid FROM "nas_make" WHERE "id" = $1 FOR UPDATE OF "nas_make"
000829.23:18:46.450 [2542] ERROR: nas_make: Permission denied.
000829.23:18:46.450 [2542] AbortCurrentTransaction
</PRE>

Sample Code

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