Heikki Linnakangas <heikki.linnakangas@enterprisedb.com> writes:
> When the set-returning-function feature was written originally, years
> ago, the tuple at a time mode did really work tuple at a time. But it
> had issues and was axed out of the patch before it was committed, to
> keep it simple. The idea was to revisit it at some point, but it hasn't
> bothered anyone enough to fix it. It's basically "not implemented yet".
It depends on call context --- you're speaking of the nodeFunctionScan
context, but I believe an SRF called in the select targetlist will
operate in tuple-at-a-time mode if the function allows.
regards, tom lane