Thread: How to find the final transformed query in postgresql
Hi Geeks,
Env: postgres12
I am new to postgres and coming from an Oracle background. Please excuse me if I am not asking valid questions.
I would like to know if postgres performs any transformations when it does the parsing? If yes, is there a way we can get the final transformed query?
Thanks,
Goti
Goti <aryan.goti@gmail.com> writes: > I would like to know if postgres performs any transformations when it does > the parsing? This might be helpful reading: https://www.postgresql.org/docs/current/overview.html > If yes, is there a way we can get the final transformed query? See debug_print_parse and friends [1]. Depending on what you mean by "final transformed query", you might instead want debug_print_rewritten, or maybe you want the plan, in which case EXPLAIN is a much friendlier way to look at it than debug_print_plan. regards, tom lane [1] https://www.postgresql.org/docs/current/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-WHAT
Thanks a lot Tom.
Thanks,
Goti
On Mon, Apr 18, 2022 at 7:43 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
Goti <aryan.goti@gmail.com> writes:
> I would like to know if postgres performs any transformations when it does
> the parsing?
This might be helpful reading:
https://www.postgresql.org/docs/current/overview.html
> If yes, is there a way we can get the final transformed query?
See debug_print_parse and friends [1]. Depending on what you mean by
"final transformed query", you might instead want debug_print_rewritten,
or maybe you want the plan, in which case EXPLAIN is a much friendlier
way to look at it than debug_print_plan.
regards, tom lane
[1] https://www.postgresql.org/docs/current/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-WHAT