On 10-05-2016 21:12, David E. Wheeler wrote:
> This makes sense, of course, and I could fix it by comparing text
> values instead of json values when the values are JSON. But of course
> the lack of a = operator is not limited to JSON. So I’m wondering if
> there’s an interface at the SQL level to tell me whether a type has
> an = operator? That way I could always use text values in those
> situations.
There isn't an equality notation at catalogs. You could try "SELECT
oprname FROM pg_operator WHERE oprcode::text ~ 'eq'" but it is too
fragile. You could also try oprname, oprrest or oprjoin but the result
is worse than the former solution. You definitely need a hack.

Also, IS DISTINCT FROM is an alias for = operator per standard IIRC.

   Euler Taveira                   Timbira - http://www.timbira.com.br/
   PostgreSQL: Consultoria, Desenvolvimento, Suporte 24x7 e Treinamento

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