How to create/initialize/access an execution plan

> Hi all,
>
> I need a help and an advice on playing around execution plans. I need a
> direct
> access to a 'plan structure' and change some fields. Even one step more, I
> need to create an execution plan directly w/o issuing an SQL statement (i.e.
>
> skipping parser and optimizer phases) and initialize (fill in the fields)
> it.
>
> I searched a lot to find a suitable documentation and example set, but I
> couldn't find any. If you give some advices on how to create a plan
> node/structure (directly w/o an sql statement or query tree assuming
> that I have my own plan in my mind) and how to play around it (change
> fields), I would really appreciate it.
>
> Thanks in advance,
>
> PS: I tried to access fields of a plan returned by SPI_prepare(), but I
> couldn't manage it either.
>
>
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