Tom Lane wrote:

I wonder whether there is any reasonable way to determine which data
structures are responsible for how much space ... in my test I'm seeing

MessageContext: 822075440 total in 104 blocks; 4510280 free (1 chunks); 
817565160 used
ExecutorState: 8024624 total in 3 blocks; 20592 free (12 chunks); 8004032 used

so it seems mostly not the executor's fault, but that's not much to go

I was doing it by sprinkling MemoryContextStats() in various places. I'll spend some time again later today and see if I can narrow it down to specific data structures using that. It shouldn't be too hard -- the patch I sent last night only pfrees a few structures, and they represent the bulk of what we need to clean up.


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