TableAmRoutine's index_build_range_scan thinks that parameter #8 is called end_blockno, but table_index_build_range_scan and heapam_index_build_range_scan and BRIN's summarize_range all agree that it's the number of blocks to be scanned. I assume that this got changed at some point while Andres was hacking on it and this one place just never got updated.
Proposed patch attached. Since this seems like a bug, albeit a harmless one, I propose to commit this to v12. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
0001-tableam-Fix-index_build_range_scan-parameter-name.patch
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