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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