Konstantin Knizhnik <k.knizhnik@postgrespro.ru> writes:
> On 20.03.2018 17:00, Tom Lane wrote:
>> It's intentional because that's not considered an executable
>> expression.
> I tried to apply this function to the argument of Aggref and it has
> exactly this kind.
> Aggref is executable expression. This is why I thought that all its
> arguments also should be considered as executable expressions, shouldn't
> they?
Not really. They're a list of executable expressions, which is not the
same thing --- in particular, exprType() on the whole list wouldn't give a
useful result. The TargetEntrys are best thought of as part of the list
superstructure.
regards, tom lane