The following bug has been logged online:

Bug reference:      3259
Logged by:          Thomas
Email address:      [EMAIL PROTECTED]
PostgreSQL version: 8.2.1
Operating system:   WinXP SP2
Description:        Problem with automatic string cast
Details: 

I have this SQL:

select * from (select 'years' as recurrence) p where recurrence = 'years'

it gives:

ERROR: failed to find conversion function from "unknown" to text SQL state:
XX000


but this one is ok:

select * from (select 'years' as recurrence union select 'years' as
recurrence) p where recurrence='years'

it gives:

recurrence text
'years'


this is a default installation with the binaries from postgresql.org with no
changes in the configs:
PostgreSQL 8.2.1 on i686-pc-mingw32, compiled by GCC gcc.exe (GCC) 3.4.2
(mingw-special)

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