On 06/09/13 09:13, Szymon Guz wrote:
Hi,
why isn't 'aa' always treated as string?
with x as (
select
'1' a,
'2' b
)
SELECT levenshtein(a, b), length(a)
FROM x;
ERROR: failed to find conversion function from unknown to text
Why should I cast '1' to '1'::TEXT to satisfy a function (TEXT, TEXT)?
I think it's to do with the CTE. Presumably its types get fixed
separately from the SELECT levenshtein() call. A quoted literal is type
"unknown" until it has a context. It could be a date, point, hstore etc.
If you use the literals directly the context lets PostgreSQL figure it out.
SELECT levenshtein('1','2');
--
Richard Huxton
Archonet Ltd
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