Re: Reducing header interdependencies around heapam.h et al.

0001 -- looks reasonable.  One hunk in executor.h changes LockTupleMode
to "enum LockTupleMode", but there's no need for that.

AFAIK the only reason to have the struct FooBarData vs. FooBar (ptr)
split is so that it's possible to refer to structs without having
the full struct definition.  I think changing uses of FooBar to "struct
FooBarData *" defeats the whole purpose -- it becomes pointless noise,
confusing the reader for no gain.  I've long considered that the struct
definitions should appear in "internal" headers (such as
htup_details.h), separate from the pointer typedefs, so that it is the
forward struct declarations (and the pointer typedefs, where there are
any) that are part of the exposed API for each module, and not the
struct definitions.  

I think that would be much more invasive, though, and it's unlikely to
succeed as easily as this simpler approach is.

I think MissingPtr is a terrible name.  Can we change that while at this?

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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