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Improve checking of child pages in contrib/amcheck.
This commit eliminates lossiness in check for missing parent downlinks inB-tree. Instead of collecting lossy bitmap, we check for missing downlinkswhile visiting child pages referenced by downlinks of target level. Wetraverse from previous child page to the subsequent child page by right links.Intermediate pages are candidates to have lost parent downlinks.Also this commit introduces matching of child high key to the pivot key ofit's parent.Discussion:https://postgr.es/m/CAPpHfduoF-c4RhOyOm%3D4-Y367%2B8txq9Q6iM_ty0OYc8si1Abww%40mail.gmail.comAuthor: Alexander KorotkovReviewed-by: Peter Geoghegan1 parenta88a285 commitd114cc5
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