BUG #18923: pg_dump 18beta1 fails to process complex table names

The following bug has been logged on the website:

Bug reference: 18923
Logged by: Philippe BEAUDOIN
Email address: phb(dot)emaj(at)free(dot)fr
PostgreSQL version: 18beta1
Operating system: Linux
Description:

I have just run the E-Maj project regression test suite with PG18 beta1 and
found a pg_dump abort when trying to dump a schema prefixed table having a
complex name including single quote, double quote and space.
Here is a test case to reproduce it :
#!/bin/sh
PG18_BIN=/home/postgres/pg/pg18/bin
PG18_PORT=5418
echo "------ Setup a new database with a single schema and table"
$PG18_BIN/dropdb -h localhost -p $PG18_PORT --if-exists bug
$PG18_BIN/createdb -h localhost -p $PG18_PORT bug
$PG18_BIN/psql -h localhost -p $PG18_PORT bug <<EOF
select version();
SET client_min_messages TO WARNING;
CREATE SCHEMA "phil's schema""3";
SET search_path="phil's schema""3";
DROP TABLE IF EXISTS "phil's tbl1";
CREATE TABLE "phil's tbl1" (
"phil's col11" INT NOT NULL PRIMARY KEY,
"phil's col12" TEXT
);
EOF
echo "------ Dump the database"
$PG18_BIN/pg_dump --version
$PG18_BIN/pg_dump -h localhost -p $PG18_PORT --verbose bug >/dev/null
And here is what I get :
------ Setup a new database with a single schema and table
version
----------------------------------------------------------------------------------------------------------
PostgreSQL 18beta1 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu
13.3.0-6ubuntu2~24.04) 13.3.0, 64-bit
(1 row)
SET
CREATE SCHEMA
SET
DROP TABLE
CREATE TABLE
------ Dump the database
pg_dump (PostgreSQL) 18beta1
pg_dump: executing SELECT pg_catalog.set_config('search_path', '', false);
pg_dump: last built-in OID is 16383
pg_dump: reading extensions
pg_dump: identifying extension members
pg_dump: reading schemas
pg_dump: reading user-defined tables
pg_dump: reading user-defined functions
pg_dump: reading user-defined types
pg_dump: reading procedural languages
pg_dump: reading user-defined aggregate functions
pg_dump: reading user-defined operators
pg_dump: reading user-defined access methods
pg_dump: reading user-defined operator classes
pg_dump: reading user-defined operator families
pg_dump: reading user-defined text search parsers
pg_dump: reading user-defined text search templates
pg_dump: reading user-defined text search dictionaries
pg_dump: reading user-defined text search configurations
pg_dump: reading user-defined foreign-data wrappers
pg_dump: reading user-defined foreign servers
pg_dump: reading default privileges
pg_dump: reading user-defined collations
pg_dump: reading user-defined conversions
pg_dump: reading type casts
pg_dump: reading transforms
pg_dump: reading table inheritance information
pg_dump: reading event triggers
pg_dump: finding extension tables
pg_dump: finding inheritance relationships
pg_dump: reading column info for interesting tables
pg_dump: flagging inherited columns in subtables
pg_dump: reading partitioning data
pg_dump: reading indexes
pg_dump: flagging indexes in partitioned tables
pg_dump: reading extended statistics
pg_dump: reading constraints
pg_dump: reading triggers
pg_dump: reading rewrite rules
pg_dump: reading policies
pg_dump: reading row-level security policies
pg_dump: reading publications
pg_dump: reading publication membership of tables
pg_dump: reading publication membership of schemas
pg_dump: reading subscriptions
pg_dump: reading subscription membership of tables
pg_dump: reading large objects
pg_dump: reading dependency data
pg_dump: saving encoding = UTF8
pg_dump: saving "standard_conforming_strings = on"
pg_dump: saving "search_path = "
pg_dump: creating SCHEMA "phil's schema"3"
pg_dump: creating TABLE "phil's schema"3.phil's tbl1"
pg_dump: processing data for table "phil's schema"3.phil's tbl1"
pg_dump: dumping contents of table "phil's schema"3.phil's tbl1"
pg_dump: error: query failed: ERROR: syntax error at or near "s"
LINE 1: EXECUTE getAttributeStats('{"phil's schema""3","phil's schem...
^
pg_dump: detail: Query was: EXECUTE getAttributeStats('{"phil's
schema""3","phil's schema""3"}'::pg_catalog.name[],'{"phil's tbl1","phil's
tbl1_pkey"}'::pg_catalog.name[])