TOAST & vacuum

FYI,
   TOAST  is now vacuum-safe. When needed, the toaster creates a   second  heap  tuple,  containing  only  plain  or
compressed  values.  This one is then returned by the heap access methods   to  the  caller,  so  indices  will  never
contain external   references.
 
   The  changes  are  covered  by  #ifdef  TOAST_INDICES, so can   easily be disabled at the time we have  file
versioning and   can recreate indices during vacuum.
 


Jan

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