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This is a very unlikely condition during checking a B-tree unique constraint, meaning that the index structure is violated badly, and we shouldn't continue checking to avoid endless loops, etc. So it's worth immediately throwing an error. Reported-by: Peter Geoghegan Discussion: https://postgr.es/m/CAH2-Wzk%2B2116uOXdOViA27SHcr31WKPgmjsxXLBs_aTxAeThzg%40mail.gmail.com Author: Pavel Borisov