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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

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# Makefile for access/nbtree
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#
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# IDENTIFICATION
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# $Header: /cvsroot/pgsql/src/backend/access/nbtree/Makefile,v 1.11 2001/07/15 22:48:16 tgl Exp $
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# $Header: /cvsroot/pgsql/src/backend/access/nbtree/Makefile,v 1.12 2003/02/21 00:06:21 tgl Exp $
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#
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#-------------------------------------------------------------------------
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include $(top_builddir)/src/Makefile.global
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OBJS = nbtcompare.o nbtinsert.o nbtpage.o nbtree.o nbtsearch.o \
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nbtstrat.o nbtutils.o nbtsort.o
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nbtstrat.o nbtutils.o nbtsort.o nbtxlog.o
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all: SUBSYS.o
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‎src/backend/access/nbtree/README

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