Re: BUG #15700: PG 10 vs. 11: Large increase in memory usage when selecting BYTEA data (maybe memory leak)

Andres Freund <andres@anarazel.de> writes:
> But are we actually prepared to assume that nothing ever leaks in
> receivers? That's, as far as I can tell, not a documented
> assumption.

There's a lot that's not documented there :-(

> We're also assuming that we don't leak into MessageContext over such
> cycles, which seems wrong. At the very least things like
> errdetail_params() are happy to leak into MessageContext.

This leak isn't in MessageContext; if it were, there likely wouldn't
have been a noticeable problem.  It's leaking in the executor's
context over repeat ExecutorRun cycles in the same execution state.
We do have an expectation that there won't be per-row leakage in
the ExecutorState.

            regards, tom lane