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postgres-lambda-diff

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    First steps towards index scans with heap access decoupled from index
    Tom Lane authored 
    access: define new index access method functions 'amgetmulti' that can
fetch multiple TIDs per call.  (The functions exist but are totally
untested as yet.)  Since I was modifying pg_am anyway, remove the
no-longer-needed 'rel' parameter from amcostestimate functions, and
also remove the vestigial amowner column that was creating useless
work for Alvaro's shared-object-dependencies project.
Initdb forced due to changes in pg_am.
    bf3dbb58
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    user avatar bf3dbb58
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    PostgreSQL Database Management System
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