pgsql: Teach const-expression simplification to simplify boolean

Поиск
Список
Период
Сортировка
От tgl@svr1.postgresql.org (Tom Lane)
Тема pgsql: Teach const-expression simplification to simplify boolean
Дата
Msg-id 20050327191802.81C17536C0@svr1.postgresql.org
обсуждение исходный текст
Список pgsql-committers
Дерево обсуждения 
Log Message:
-----------
Teach const-expression simplification to simplify boolean equality cases,
that is 'x = true' becomes 'x' and 'x = false' becomes 'NOT x'.  This isn't
all that amazingly useful in itself, but it ensures that we will recognize
the different forms as being logically equivalent when checking partial
index predicates.  Per example from Patrick Clery.

Modified Files:
--------------
    pgsql/src/backend/optimizer/util:
        clauses.c (r1.188 -> r1.189)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c.diff?r1=1.188&r2=1.189)

В списке pgsql-committers по дате отправления:

Предыдущее
От: tgl@svr1.postgresql.org (Tom Lane)
Дата:
Сообщение: pgsql: Eliminate duplicate hasnulls bit testing in index tuple access,
Следующее
От: tgl@svr1.postgresql.org (Tom Lane)
Дата:
Сообщение: pgsql: First steps towards index scans with heap access decoupled from