prepared queries in plperl

Hi,

I needed prepared queries in plperl, but there's none, so I baked a patch that
defines two extra perl functions, spi_prepare and spi_exec_prepared, and it
seems to work more-less ok. The patch is here,

http://www.karasik.eu.org/misc/plperl.diff

but it's not in any way a final patch; having no previous experience with
postgres server programming there's a fat chance I forgot or misplaced
something, especially that most of it is copy-pasted from plperl.c and pltcl.c
. I would like to ask if someone could review it, so I could reshape it into
something more appropriate for including into -devel.

--
Thanks,
Dmitry Karasik

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