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Update comments on nbtree stack struct.

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Adjust the struct comment that describes how page splits use their
descent stack to cascade up the tree from the leaf level.

In passing, fix up some unrelated nbtree comments that had typos or were
obsolete.
This commit is contained in:
Peter Geoghegan
2019-08-21 13:50:27 -07:00
parent c45643d618
commit 091bd6befc
3 changed files with 8 additions and 5 deletions
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2
src/backend/access/nbtree/nbtsort.c
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@@ -953,7 +953,7 @@ _bt_buildadd(BTWriteState *wstate, BTPageState *state, IndexTuple itup)
*
* We don't try to bias our choice of split point to make it more
* likely that _bt_truncate() can truncate away more attributes,
* whereas the split point passed to _bt_split() is chosen much
* whereas the split point used within _bt_split() is chosen much
* more delicately. Suffix truncation is mostly useful because it
* improves space utilization for workloads with random
* insertions. It doesn't seem worthwhile to add logic for

4
src/backend/access/nbtree/nbtsplitloc.c
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@@ -1060,7 +1060,7 @@ _bt_split_penalty(FindSplitData *state, SplitPoint *split)
}
/*
* Subroutine to get a lastleft IndexTuple for a spit point from page
* Subroutine to get a lastleft IndexTuple for a split point from page
*/
static inline IndexTuple
_bt_split_lastleft(FindSplitData *state, SplitPoint *split)
@@ -1076,7 +1076,7 @@ _bt_split_lastleft(FindSplitData *state, SplitPoint *split)
}
/*
* Subroutine to get a firstright IndexTuple for a spit point from page
* Subroutine to get a firstright IndexTuple for a split point from page
*/
static inline IndexTuple
_bt_split_firstright(FindSplitData *state, SplitPoint *split)