2016-01-06 19:52 GMT+01:00 Robert Haas <robertmh...@gmail.com>: > On Sun, Jan 3, 2016 at 3:24 PM, Peter Krauss <ppkra...@gmail.com> wrote: > > The usefulness of ->> operator is indisputable, but even with boolean > or > > numeric values, with good binary internal representation, it returns > JSONB > > value as text data type. > > > > The simple (myJSONB->>'myField')::expectedType is not enough because: > > > > 1) there are no internal optimization, need two-step casting, first > > bynary-to-text, them text-to-expectedType. > > > > 2) if expectedType is not the expected (in the associated jsonb_typeof), > > generates an error... The ideal "return NULL" convention is not easy to > > implement with usual casting. >
@2 looks little bit dangerous. If expected number isn't number, but a text, then I'll expect a exception in all cases. Pavel > > Agreed, something like this would be useful. > > > -- > Robert Haas > EnterpriseDB: http://www.enterprisedb.com > The Enterprise PostgreSQL Company > > > -- > Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-hackers >
