On Fri, 10 Jan 2025 at 22:53, Vladlen Popolitov <v.popoli...@postgrespro.ru> wrote: > In case of query > select count(*) from test_table where a_1 = 1000000; > I would expect increase of query time due to additional if...else . It > is not clear > what code was eliminated to decrease query time.
Are you talking about the code added to ExecInitSeqScan() to determine which node function to call? If so, that's only called during executor startup. The idea here is to reduce the branching during execution by calling one of those special functions which has a more specialised version of the ExecScan code for the particular purpose it's going to be used for. David
