Re: LATERAL

Robert Haas <robertmhaas@gmail.com> writes:
>> Yeah, this is grotty. �It appears that the comment introducing
>> ExecReScan() is somewhat incorrect. �It asserts that exprCtxt is used
>> only

> Sigh.

> ...is used only for index scans.  However, it's actually also used for
> bitmap scans (both heap and index) and TID scans.

Yeah, the comment was probably correct when written.

> Also, there appears
> to be an effort by nodes that don't use exprCtxt directly to propagate
> down through the node tree, which doesn't seem to make much sense if
> this is only intended to be used on the inner side of a nestloop.

That's just dead code, which is a good thing because the coverage is
pretty incomplete.
        regards, tom lane