st 20. 1. 2021 v 21:32 odesílatel Tom Lane <tgl@sss.pgh.pa.us> napsal:
Pavel Stehule <pavel.stehule@gmail.com> writes: > st 20. 1. 2021 v 21:07 odesílatel Tom Lane <tgl@sss.pgh.pa.us> napsal: >> Uh, what? I don't understand what this "partition context" is.
> It was my name for an access to window partition local memory - > WinGetPartitionLocalMemory
Ah.
> We need some interface for this cache
I'm not convinced we need to expose that, or that it'd be very satisfactory to plpgsql users if we did. The fact that it's fixed-size and initializes to zeroes are both things that are okay for C programmers but might be awkward to deal with in plpgsql code. At the very least it would greatly constrain what data types you could usefully store.
So I'd be inclined to leave that out, at least for the first version.
I think this functionality is relatively important. If somebody tries to implement own window function, then he starts with some variation of the row_num function.
We can support only types of fixed length to begin.
