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Make btree index structure adjustments and WAL logging changes needed to
support btree compaction, as per proposal of a few days ago. btree index pages no longer store parent links, instead they have a level indicator (counting up from zero for leaf pages). The FixBTree recovery logic is removed, and replaced by code that detects missing parent-level insertions during WAL replay. Also, generate appropriate WAL entries when updating btree metapage and when building a btree index from scratch. I believe btree indexes are now completely WAL-legal for the first time. initdb forced due to index and WAL changes.
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- src/backend/access/nbtree/Makefile 2 additions, 2 deletionssrc/backend/access/nbtree/Makefile
- src/backend/access/nbtree/README 371 additions, 179 deletionssrc/backend/access/nbtree/README
- src/backend/access/nbtree/nbtinsert.c 314 additions, 867 deletionssrc/backend/access/nbtree/nbtinsert.c
- src/backend/access/nbtree/nbtpage.c 163 additions, 93 deletionssrc/backend/access/nbtree/nbtpage.c
- src/backend/access/nbtree/nbtree.c 1 addition, 398 deletionssrc/backend/access/nbtree/nbtree.c
- src/backend/access/nbtree/nbtsearch.c 89 additions, 44 deletionssrc/backend/access/nbtree/nbtsearch.c
- src/backend/access/nbtree/nbtsort.c 65 additions, 33 deletionssrc/backend/access/nbtree/nbtsort.c
- src/backend/access/nbtree/nbtxlog.c 780 additions, 0 deletionssrc/backend/access/nbtree/nbtxlog.c
- src/backend/access/transam/rmgr.c 19 additions, 18 deletionssrc/backend/access/transam/rmgr.c
- src/backend/access/transam/xlog.c 47 additions, 11 deletionssrc/backend/access/transam/xlog.c
- src/include/access/nbtree.h 213 additions, 117 deletionssrc/include/access/nbtree.h
- src/include/access/xlog.h 4 additions, 2 deletionssrc/include/access/xlog.h
- src/include/catalog/catversion.h 2 additions, 2 deletionssrc/include/catalog/catversion.h
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