Re: failed to find conversion function from "unknown" to text

Szűcs Gábor <surrano@gmail.com> writes:
>    [local]:tir=# select case 'a' when 'a' then 1 else 2 end as asdf;
>    ERROR:  failed to find conversion function from "unknown" to text

> This worked up to v7.4.6, and couldn't see it in the "Migration" part of the 
> HISTORY file.

This is an unintended side effect of the change to evaluate CASE
constructs more efficiently.  I'll fix it.
        regards, tom lane