Jan Wieck <JanWieck@Yahoo.com> writes:
> Having done something similar for the SPI manager once, so that
> parameters can have unknown type and the code calling SPI_prepare() will
> find the chosen types in the type array, so that the code calling
> SPI_execp() can do the appropriate type casting, my idea is that
> preparing a statement does the same and exec prepared actually accepts
> unknown type arguments and calls the typein function before running the
> plan. However, I still need to look at the code ...
This is already *done*. All we need is to devise a reasonable API for
libpq to provide access to the V3-protocol Prepare message. I suspect
that we'd want it to bundle a Prepare and a Describe Statement
operation, so that the user would get back the list of actual argument
types in the same call that issues the prepare. But I haven't thought
it through in detail.
> If this is doable that way, we could log it as an open issue that needs
> to be finished for release.
[ shrug ] Arguably it was something that should have been done for 7.4.
If someone wants to step up to the plate now, I won't stand in the way.
regards, tom lane