Re: tuplesort_gettuple_common() and *should_free argument

On Mon, Dec 12, 2016 at 2:30 PM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
> On Mon, Dec 12, 2016 at 9:31 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> I think this patch might have a bug. In the existing code,
>> tuplesort_gettupleslot sets should_free = true if it isn't already
>> just before calling ExecStoreMinimalTuple((MinimalTuple) stup.tuple,
>> slot, should_free), so it seems that ExecStoreMinimalTuple() will
>> always get "true" as the fourth argument. However the patch changes
>> that line of code like this:
>>
>> + ExecStoreMinimalTuple((MinimalTuple) stup.tuple, slot, false);
>>
>> So the patch seems to have the effect of changing the fourth argument
>> to this call to ExecStoreMinimalTuple() from always-true to
>> always-false. I might be missing something, but my guess is that's
>> not right.
>
> There was a memory leak added by 0001-*, but then fixed by 0002-*. I
> should have done more testing of 0001-* alone. Oops.
>
> Attached revision of 0001-* fixes this. A revised 0002-* is also
> attached, just as a convenience for reviewers (they won't need to
> resolve the conflict themselves).

Committed 0001.

--
Robert Haas
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