"Jim C. Nasby" <jnasby@pervasive.com> writes:
> You might try rewriting the coalesces into a row comparison...
> WHERE row($4, $5, ...) IS NOT DISTINCT FROM row(interface_id, source_id, ...)
That would be notationally nicer, but no help performance-wise; I'm
fairly sure that IS DISTINCT doesn't get optimized in any fashion
whatsoever :-(
What might be worth trying is functional indexes on the COALESCE(foo,0)
expressions. Or if possible, consider revising your data schema to
avoid using NULLs in a way that requires assuming that NULL = NULL.
regards, tom lane
