Re: json api WIP patch

> The processing functions have been extended to provide populate_record() and populate_recordset() functions.The latter in particular could be useful in decomposing a piece of json representing an array of flat objects (a fairly common pattern) into a set of Postgres records in a single pass.

So this would allow an 'insert into ... select ... from 
<unpack-the-JSON>(...)'?

I had been wondering how to do such an insertion efficiently in the 
context of SPI, but it seems that there is no SPI_copy equiv that would 
allow a query parse and plan to be avoided.

Is this mechanism likely to be as fast as we can get at the moment in 
contexts where copy is not feasible?