"Robert Haas" <robertmhaas@xxxxxxxxx> writes: > Well, presumably CASE WHEN <expr1> THEN <constant1> WHEN <expr2> THEN > <constant2> WHEN <expr3> THEN <constant3> ... END = <constantn> could > be simplified to <exprn>. Not without breaking the order-of-evaluation guarantees. Consider case when x=0 then 0 when 1/x = 42 then 1 end = 1 This expression should not suffer a divide-by-zero failure but your proposal would allow it to do so. regards, tom lane -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
