Threaded Sorting

Did anybody think about threaded sorting so far?
Assume an SMP machine. In the case of building an index or in the case
of sorting a lot of data there is just one backend working. Therefore
just one CPU is used.
What about starting a thread for every temporary file being created?
This way CREATE INDEX could use many CPUs.
Maybe this is worth thinking about because it will speed up huge
databases and enterprise level computing.

Best regards,

Hans-Jürgen Schönig

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