nbtree: Rename BT_RESERVED_OFFSET_MASK.
authorPeter Geoghegan <pg@bowt.ie>
Wed, 22 Apr 2020 23:09:55 +0000 (16:09 -0700)
committerPeter Geoghegan <pg@bowt.ie>
Wed, 22 Apr 2020 23:09:55 +0000 (16:09 -0700)
commit48107e396f75ea65192153707a8c476f66b59061
treeea54018702f5ea69d3873f2e50872a5a15a503d0
parentde0dc1a84710f127fdd40f87e783797cc2d69a77
nbtree: Rename BT_RESERVED_OFFSET_MASK.

The mask was added by commit 8224de4f, which introduced INCLUDE nbtree
indexes.  The status bits really were reserved initially.  We now use 2
out of 4 of the bits for additional tuple metadata, though.  Rename the
mask to BT_STATUS_OFFSET_MASK.

Also consolidate related nbtree.h code comments about the format of
pivot tuples and posting list tuples.
src/include/access/nbtree.h