How to find the final transformed query in postgresql

[Goti]

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

Re: How to find the final transformed query in postgresql

[Tom Lane]

Goti  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

Re: How to find the final transformed query in postgresql

[Goti]

Thanks a lot Tom.

Thanks,

Goti


On Mon, Apr 18, 2022 at 7:43 PM Tom Lane  wrote:

> Goti  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
>