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Failures in allocations could lead to crashes with NULL pointer dereferences . Memory context TopMemoryContext is used instead to keep alive the plans allocated in the session. A more specific context could be used here, but this is left for later. Reported-by: Jian Zhang Author: Michael Paquier Reviewed-by: Tom Lane, Andres Freund Discussion: https://postgr.es/m/16190-70181c803641c3dc@postgresql.org