pgsql: Improve planner's estimation of the size of an append relation:

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От tgl@postgresql.org (Tom Lane)
Тема pgsql: Improve planner's estimation of the size of an append relation:
Дата
Msg-id 20080627035655.80207754857@cvs.postgresql.org
обсуждение исходный текст
Список pgsql-committers
Дерево обсуждения 
Log Message:
-----------
Improve planner's estimation of the size of an append relation: rather than
taking the maximum of any child rel's width, we should weight the widths
proportionally to the number of rows expected from each child.  In hindsight
this is obviously correct because row width is really a proxy for the total
physical size of the relation.  Per discussion with Scott Carey (bug #4264).

Modified Files:
--------------
    pgsql/src/backend/optimizer/path:
        allpaths.c (r1.170 -> r1.171)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/allpaths.c?r1=1.170&r2=1.171)
    pgsql/src/backend/optimizer/plan:
        createplan.c (r1.240 -> r1.241)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c?r1=1.240&r2=1.241)

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