From: "Soroosh Sardari" <soroosh.sard...@gmail.com>
I wonder if anyone could help me to find the module of pg that is
responsible for the temporal space and external sort in the PG source code.

See src/backend/utils/sort/ for sort implementation.
That uses BufFile in src/backend/storage/file/buffile.c,
which in turn uses OpenTemporaryFile in src/backend/storage/file/fd.c.

Regards
MauMau



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