gistfile1.txt

    WIP: Add support for copying node tree into single allocation.
    
    As an example as to why one would want that, here's a
    MemoryContextStats for the same query being added to the
    plancache. The query is just a randomly selected one among the queries
    issued by \d+.
    
    PREPARE foo AS SELECT c.relchecks, c.relkind, c.relhasindex, c.relhasrules, c.relhastriggers, c.relrowsecurity, c.relforcerowsecurity, false AS relhasoids>
    EXECUTE foo ;
    
    With single-allocation:
    CachedPlan: 24504 total in 2 blocks; 664 free (0 chunks); 23840 used
    Grand total: 24504 bytes in 2 blocks; 664 free (0 chunks); 23840 used
    
    Default:
    CachedPlan: 65536 total in 7 blocks; 16016 free (0 chunks); 49520 used
    Grand total: 65536 bytes in 7 blocks; 16016 free (0 chunks); 49520 used