SPI functions to work with the Execution Plan

Thanks for answering:

I am a member of the PostgreSQL development community here in Cuba. My proposal is to develop an extension to PostgreSQL that allows query execution using multiple threads. The central idea is to get the execution plan ready to run, but send him to run with the same postgres executor concurrently with the help of a C library that handles the job with the user-level threads and kernel level.
I would appreciate any solution or suggestion that you could help me to fulfill this goal.
Is there any query to return the plan or any similar data structure?

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