Chapman Flack <chap@anastigmatix.net> writes:
> I am encountering, here and there, an idiom like
> pstrdup(TextDatumGetCString(foo))
> or a pre-8.4 version,
> pstrdup(DatumGetCString(DirectFunctionCall1(textout, foo)))
> It's leading me to question my sanity because it appears to me
> that both text_to_cstring (underlying TextDatumGetCString) and
> textout already return a string palloc'd in the current context,
> and that pstrdup (without any change of context) can't be accomplishing
> anything. I'm probably missing something crucial, but what?
No, you're right: pstrdup in that context is a useless waste of cycles and
memory.
A quick grep in the current PG sources shows me only two occurrences of
the former, both in the same function and both doubtless introduced by
the same misinformed author. I find no occurrences of the latter.
regards, tom lane