The following bug has been logged on the website:
Bug reference: 8199
Logged by: Rafal Rzepecki
Email address: [email protected]
PostgreSQL version: 9.2.4
Operating system: Ubuntu 13.04
Description:
Row datatypes are currently not hashable, which makes it slower to use them
in a UNIQUEd query and impossible to use them in a recursive query (unless
using UNION ALL):
divide=# create type the_row as (mfg text, id text);
CREATE TYPE
divide=# with recursive rec(w, i) as (
select '(pow,xyzzy)'::the_row, 3
union
select w, i-1 from rec where i > 0
) select * from rec;
ERROR: could not implement recursive UNION
DETAIL: All column datatypes must be hashable.
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