>> * Proposed changes to allow amgetnext to return the actual index keys,
>> allowing certain types of "unindexable" quals to be checked without
>> having to fetch the heap entry.  For example a LIKE condition could be
>> fully checked against the index entry.  

In the extreme we could build tuples and push them up several nodes -- even
including joins -- before fetching the rest of the attributes from the heap.

-- 
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com
  Get trained by Bruce Momjian - ask me about EnterpriseDB's PostgreSQL 
training!

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