[HACKERS] Questions about HeapTupleHeaderData

[Zdenek Kotala]

I try to understand why HeapTupleHeaderData structure has t_datum 
member. This is use only on few places and from my point of view this 
information should be stored in the HeapTupleData structure or split 
HeapTupleHeaderData it into two structures (DatumTupleHeaderData). The 
idea behind my question is that I need process different versions of 
HeapTupleHeaders for different page layouts and I try to discover how to 
deal with the union.

                Thanks Zdenek

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