One of the important next steps for PL/Parrot is to improve the security subsystem, which will require changes to Parrot core. Parrot has only a high-level Parrot Developer Doc (PDD) that describes how security should work, but still lacks an implementation. Thus, PL/Parrot finds itself in the situation of being able to drive the development of security features in Parrot. This is very exciting and I am researching various hardening solutions. Various ideas have been thrown around, but removing or replacing certain opcodes at the lowest level is the most secure solution. How to do this, properly at run-time, is the fun part.
I will be talking about PL/Parrot at PGCon 2010, which will be very exciting. I am hoping to meet many people in the PostgreSQL community and show some PostgreSQL internals hackers why hacking on PL/Parrot is so fun and so important.
PL/Parrot is so important because PL's are hard to write and maintain. My vision is that most of the hard work goes into PL/Parrot, and then languages built on top of Parrot (HLL's), will have a very simple time piggy-backing on top of that infrastructure. Currently, only PL/PIR exists. Stored procedures can be written in PIR. The next steps will be getting a HLL working on PL/Parrot, such as NotQuitePerl (NQP) or Rakudo Perl 6. If you want to get your favorite HLL working on PL/Parrot, I surely won't stop you.
There are also many benefits to writing stored procedures in PIR. PIR will have the closest possible speed to C than any HLL run on Parrot, so if speed is your main concern, you will want PL/PIR. Parrot has a garbage collector, so you don't have to do memory management in PL/PIR. This prevents crashing the server instance due to double-free errors and fun stuff like that. PIR is also platform-independent: no more need to figure out how to get your stored procedures written in C compiling on a new platform.
If you have tuits or ideas for implementing PL/NQP or PL/Rakudo or any other comments about PL/Parrot, I would love to hear them. Feel free to fork the github repo, join us in #plparrot on irc.freenode.net or on our mailing list. We also need a website and mascot. There are many ways to help, but patches are always welcome :)