[GSoC] Question about "Explicitly support predicate locks in index access methods besides btree"

Hi guys,

I'm confused about the this function, CheckForSerializableConflictOut(...).
Can anyone help me out?

It seems like this function is used to check the rw-antidependencies out
edge. This should be done when reading a written tuple. But btree does not
call this function at all. The heapam used predicatelockpage(...)...

I use to think the in and out edge will be built when rw-antidependencies
detected. CheckForSerializableConflictIn(...) can do this job. So
CheckForSerializableConflictOut(...) function really confused me.

Best Wishes!
---
Dong