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Alexander Korotkov authored
5262f7a4 have introduced parallel index scan. In order to estimate the number of parallel workers, it adds extra argument to amcostestimate() index access method API function. However, this extra argument was missed in the documentation. This commit fixes that. Discussion: https://postgr.es/m/4128fdb4-8b63-2e05-38f6-3125f8c27263%40lab.ntt.co.jp Author: Tatsuro Yamada, Alexander Korotkov Backpatch-through: 10
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