From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Zakkr <zakkr(at)zf(dot)jcu(dot)cz>, pgsql-hackers <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Re: [HACKERS] _text problem in union |
Date: | 1999-09-28 01:38:28 |
Message-ID: | 199909280138.VAA23160@candle.pha.pa.us |
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> Zakkr <zakkr(at)zf(dot)jcu(dot)cz> writes:
> > abil=> select '{"aaa"}'::_text union select '{"bbb"}'::_text;
> > ERROR: Unable to identify an ordering operator '<' for type '_text'
> > Use an explicit ordering operator or modify the query
>
> Depending on what you're trying to do, UNION ALL might be an adequate
> workaround. UNION is defined to remove duplicates, so it has to sort
> the results of the union'ed queries, which requires an ordering
> operator. UNION ALL just appends the two query results together...
>
> In the long run we probably ought to think about providing ordering
> operators for array types.
>
Added to TODO:
* Allow arrays to be ORDER'ed
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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