On 10 May 2016 at 13:38, Kouhei Kaigai <kaigai@ak.jp.nec.com> wrote:
> My concern about ExecProcNode is, it is constructed with a large switch
> ... case statement. It involves tons of comparison operation at run-time.
> If we replace this switch ... case by function pointer, probably, it make
> performance improvement. Especially, OLAP workloads that process large
> amount of rows.
I imagined that any decent compiler would have built the code to use
jump tables for this. I have to say that I've never checked to make
sure though.
-- David Rowley http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training & Services