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a4957b5a72
As a result of confusion about whether the "char" type is signed or unsigned, scans for index searches like "col < 'x'" or "col <= 'x'" would start at the middle of the index not the left end, thus missing many or all of the entries they should find. Fortunately, this is not a symptom of index corruption. It's only the search logic that is broken, and we can fix it without unpleasant side-effects. Per report from Jason Kim. This has been wrong since btree_gin's beginning, so back-patch to all supported branches. Discussion: https://postgr.es/m/20210810001649.htnltbh7c63re42p@jasonk.me