Check for invalid down link while prefetching B-Tree leave pages for index-only scan #536
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…index-only scan (#9867) ## Problem See #9866 Index-only scan prefetch implementation doesn't take in account that down link may be invalid ## Summary of changes Check that downlink is valid block number Correspondent Postgres PRs: neondatabase/postgres#534 neondatabase/postgres#535 neondatabase/postgres#536 neondatabase/postgres#537 --------- Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>
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