Hello I am searching way to extensible parser (actually not bison, only transformations). I propose parserHook (transformation part). One Tom's objection is difference between heooked and unhooked parser. It serious problem.
I have one idea - only preloadable libraries. These libs have to be specified in local_preload_libraries variable, and cannot be initialised by LOAD statement. Statement LOAD should by used only for reload library. Because pre loaded library is initialised before first SQL statement should be executed, then hook is installed on time and an behave is consistent. One technique is an calling library's function "canload" before initialising. When canload returns false, then dfmgr unloads lib. I thing so this behave complements current functions PG_init and PG_finit. What I can understand, PG_init, cannot throw exception or signalise any problems with initialisation. Ideas, objections? regards Pavel Stehule -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
