postgresql: Fixed calculation of a database's max_params_num.

This parameter is used to store the size of a frequently used temporary list
and allows that it may be efficiently stored on the stack. It was accidentally
lost in commit 4d380d9, triggering an assertion in c_psql_exec_query_params().

diff --git a/src/postgresql.c b/src/postgresql.c
index 4e1c1e0..adddc00 100644 (file)
--- a/src/postgresql.c
+++ b/src/postgresql.c
@@ -289,7 +289,7 @@ static int c_psql_exec_query (c_psql_database_t *db, udb_query_t *q)
        int status;
        int i;
 
-       /* The user data may hold parameter information */
+       /* The user data may hold parameter information, but may be NULL. */
        data = udb_query_get_user_data (q);
 
        /* Versions up to `3' don't know how to handle parameters. */
@@ -631,6 +631,12 @@ static int c_psql_config_database (oconfig_item_t *ci)
                                        &db->queries, &db->queries_num);
        }
 
+       for (i = 0; (size_t)i < db->queries_num; ++i) {
+               c_psql_user_data_t *data;
+               data = udb_query_get_user_data (db->queries[i]);
+               if ((data != NULL) && (data->params_num > db->max_params_num))
+                       db->max_params_num = data->params_num;
+       }
        return 0;
 } /* c_psql_config_database */