Configuration file parameters cannot be enclosed in double quotes.

[feeling0713]

[root@feeling etc]# cat pgpool.conf |grep 'backend_clustering_mode'
backend_clustering_mode = "streaming_replication"

When I configure the parameters as shown above, the following error occurs upon starting pgpool.

[root@feeling bin]# ./pgpool -f ../etc/pgpool.conf
2026-04-07 17:22:19.588: main pid 1110399: FATAL: invalid value for parameter "backend_clustering_mode": """
2026-04-07 17:22:19.588: main pid 1110399: HINT: Available values: streaming_replication, native_replication, logical_replication, raw, snapshot_isolation.

Why doesn't it support configuring parameters with double quotes?

The issue was resolved by modifying the codes in file 'src/config/pool_config.l'

STRING          \'([^'\n]|\\.)*\'
DOUBLE_STRING   \"([^"\n]|\\.)*\"

%%

\n              Lineno++; return POOL_EOL;
[ \t\r]+        /* eat whitespace */
#.*$            /* eat comment */

{KEY}           return POOL_KEY;
{STRING}        return POOL_STRING;
{DOUBLE_STRING} return POOL_STRING;

The attachment is the patch for the aforementioned codes, and it has passed the tests.

Add-support-for-parsing-double-quotes-in-configurati.patch

[tatsuo-ishii]

Why doesn't it support configuring parameters with double quotes?

We follow the way how PostgreSQL handles postgresql.conf. PostgreSQL does not accept double quotes for string data type in postgresql.conf. The exception is, having a variable inside a string data. i.e.
search_path = '"$user", public'
Pgpool-II does not have such a feature.