On 01/14/2013 07:36 PM, Merlin Moncure wrote:
> While testing this I noticed that integer based 'get' routines are
> zero based -- was this intentional? Virtually all other aspects of
> SQL are 1 based:
>
> postgres=# select json_get('[1,2,3]', 1);
> json_get
> ----------
> 2
> (1 row)
>
> postgres=# select json_get('[1,2,3]', 0);
> json_get
> ----------
> 1
> (1 row)
>
Yes. it's intentional. SQL arrays might be 1-based by default, but
JavaScript arrays are not. JsonPath and similar gadgets treat the arrays
as zero-based. I suspect the Json-using community would not thank us for
being overly SQL-centric on this - and I say that as someone who has
always thought zero based arrays were a major design mistake,
responsible for countless off-by-one errors.
cheers
andrew
