pgsql: Fix performance issue in exprTypmod(): for a COALESCE expression,

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От tgl@svr1.postgresql.org (Tom Lane)
Тема pgsql: Fix performance issue in exprTypmod(): for a COALESCE expression,
Дата
Msg-id 20051118230843.A9FA2DBB24@svr1.postgresql.org
обсуждение исходный текст
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Log Message:
-----------
Fix performance issue in exprTypmod(): for a COALESCE expression, it
recursed twice on its first argument, leading to exponential time spent
on a deep nest of COALESCEs ... such as a deeply nested FULL JOIN would
produce.  Per report from Matt Carter.

Tags:
----
REL7_4_STABLE

Modified Files:
--------------
    pgsql/src/backend/parser:
        parse_expr.c (r1.163.2.3 -> r1.163.2.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_expr.c.diff?r1=1.163.2.3&r2=1.163.2.4)

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