I've attached another iteration of the patch that fixes the multiple-window
bug and adds (& uses) a function to create a Bitmapset using a custom
allocator. I don't think there's any outstanding problems with it now.

> Alternatively, it might be trivial to make all aggregate functions work
with ignore nulls in a window context

This is a good idea, but I'd like to keep the scope of this patch limited
for the time being - I'll look at doing this (along with the first / last /
nth value window functions) for a later release.

Thanks -


Attachment: lead-lag-ignore-nulls.patch
Description: Binary data

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