Re: Proposal for JSONB functions for internal representation casting insted text-casting

On Sun, Jan 3, 2016 at 3:24 PM, Peter Krauss <ppkrauss@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.

Agreed, something like this would be useful.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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