Re: Performance of JSON_TABLE vs jsonb_to_recordset

Alexander Lakhin <exclusion@gmail.com> writes:
> When playing with JSON_TABLE, I tried to replace tenk1 in regression tests
> with a view based on JSON_TABLE, with the same content, and discovered
> that for one sub-optimal query it's execution duration increased many-fold.
> With the preparation script attached, I see the following durations
> (for a build compiled by clang 18.1.3 with -O3):
> explain (verbose, analyze)
> select
>    (select max((select i.unique2 from tenk1 i where i.unique1 = o.unique1)))
> from tenk1 o;
> -- original tenk1
>   Execution Time: 4769.481 ms

Hm, I get about 13 ms for that example.  Do you have some really
expensive debugging infrastructure enabled, perhaps?

            regards, tom lane