Re: generic plans and "initial" pruning

[Amit Langote]

Rebased over 964d01ae90c.

-- 
Thanks, Amit Langote
EDB: http://www.enterprisedb.com

v18-0002-Optimize-AcquireExecutorLocks-by-locking-only-un.patch
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v18-0001-Move-PartitioPruneInfo-out-of-plan-nodes-into-Pl.patch

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