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estimate_path_cost_size() failed to re-use cached costs when the cached startup/total cost was 0, so it calculated the costs redundantly. This is an oversight in commit aa09cd242f; but apply the patch to HEAD only because there are no reports of actual trouble from that. Author: Etsuro Fujita Discussion: https://postgr.es/m/5C4AF3F3.4060409%40lab.ntt.co.jp