pg_stat_statements query normalization, and the 'in' operator

unixway.drive@gmail.com writes:

Given the following list of queries:

create table foo (id serial, bar integer);
select * from foo where id in (1);
select * from foo where id in (2,3);
select * from foo where id in (1,3,5);
select * from foo where id in (select id from foo);

would it be possible to have first three select queries to be normalized
into a single one so that 'select query from pg_stat_statements' returns
something like:

select * from foo where id in (...);
select * from foo where id in (select id from foo);

Wouldn't recommend holding your breath for that. But you could do the
same conversion on the client side that the parser would do anyway:

select * from foo where id = any ('{1,3,5}'::integer[]);

regards, tom lane

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