Re: POC: converting Lists into arrays

On 2019-Feb-27, Tom Lane wrote:

> I'm particularly unsure about whether we need two macros; though the
> way I initially tried it with just list_cell_is_last() seemed kind of
> double-negatively confusing in the places where the test needs to be
> not-last. Also, are these macro names too long, and if so what would
> be better?

I think "!list_cell_is_last()" is just as readable, if not more, than
the "is_not_last" locution:

appendStringInfoChar(&buf, '\'');
if (!list_cell_is_last(l))
appendStringInfoString(&buf, ", ");

I'd go with a single macro.

+1 for backpatching the new macros, too. I suspect extension authors
are going to need to provide compatibility versions anyway, to be
compilable against older minors.

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Álvaro Herrera https://www.2ndQuadrant.com/
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