| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: WIP patch for LATERAL subqueries |
| Date: | 2012-08-06 14:47:53 |
| Message-ID: | 10001.1344264473@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> Apparently Sybase and Microsoft SQL server use a slightly different
> syntax, CROSS APPLY, for this.
> http://iablog.sybase.com/paulley/2008/07/cross-and-outer-apply/
Well, this is only a blog entry and not their manual, but AFAICT that is
just a useless deviation from SQL-standard syntax; it does nothing that
"CROSS JOIN LATERAL" or "LEFT JOIN LATERAL ... ON true" wouldn't do.
I can't tell if the blogger simply doesn't know that LATERAL can be used
in a JOIN nest, or if that's actually a misfeature of the DBMS.
I'm not in favor of duplicating this.
regards, tom lane
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