Re: Losing memory references - SRF + SPI

On 05/13/2016 09:35 PM, Anderson Carniel wrote:
> I am writing a function that returns a set of tuples by using also the
> PostGIS. Thuis, I am using SRF too. It successfully returns the expected
> result when it has at most 4 tuples. However, this is not the case when
> more than 4 tuples have to be returned. When I debug the code, I found
> that the problem is in my function that transforms a cstring after a
> SPI_connection. It seems that this cstring is not valid anymore in the
> moment of this conversion (see my comment below). I know that the SPI
> uses different contexts when it init and finish its process. But, I
> don't understand why I have this problem here. Please, note that I tried
> to copy the values of the whole tuple, but I have the same problem:
> system crash after the forth call of the function. Also note that I call
> this function only in the init call of the SRF. Please I would
> appreciate any suggestion and help.

You probably need to allocate your returned values in a per query memory
context. Take a look at how it is done in, for example, crosstab() in
contrib/tablefunc.

HTH,

Joe

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