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This option selects the default transfer mode. Having an explicit option is handy to make scripts and tests more explicit. It also makes it easier to talk about a "copy" mode rather than "the default mode" or something like that, since until now the default mode didn't have an externally visible name. Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/50a97009-8ff9-ca4d-a0f6-6086a6775a5b%40enterprisedb.com