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Simplify cost_incremental_sort a bit

Tomas Vondra <tomas.vondra@postgresql.org>

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Commit: 60fbb4d762506c352c1af1229288a0753742cd95
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2020-05-01T23:33:51Z
Releases: 13.0 
Simplify cost_incremental_sort a bit

Commit de0dc1a847 added code to cost_incremental_sort to handle varno 0.
Explicitly removing the RelabelType is not really necessary, because the
pull_varnos handles that just fine, which simplifies the code a bit.

Author: Richard Guo
Discussion: https://postgr.es/m/CAMbWs4_3_D2J5XxOuw68hvn0-gJsw9FXNSGcZka9aTymn9UJ8A%40mail.gmail.com
Discussion: https://postgr.es/m/20200411214639.GK2228%40telsasoft.com

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PathChange+/−
src/backend/optimizer/path/costsize.c modified +1 −11

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