Re: PostgreSQL executing my function too many times during query

"D. Dante Lorenso" <dante(at)lorenso(dot)com> writes:
> This format causes the function to execute too many times:

> SELECT COUNT(*) AS result
> FROM credit_card
> WHERE card_number_enc = cc_encrypt('4111-1111-1111-1111', 'pwd')
> AND card_number_enc != cc_encrypt('4111111111111111', 'pwd');

If the function is marked immutable that query should certainly evaluate
it only twice.

I notice that the EXPLAINs show it as credit_card_encrypt() not
cc_encrypt() --- maybe you got confused about which function you
were adjusting the properties of?

regards, tom lane