Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> But actually here's an even simpler workaround, which is IMHO less
> ugly than the original one:
> SELECT foo, bar, (SELECT regexp_matches(bar, pattern)) FROM table;
Doesn't that blow up if the subselect returns more than one row?
I think you could make it work by wrapping regexp_matches in a
simple (non-SETOF) SQL function, but just writing out the sub-SELECT
doesn't do it. This goes back to the recent discussion of why SQL
functions can't always be inlined --- the semantics are a bit
different in some cases.
regards, tom lane