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Tweak some nbtree-related code comments.

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This commit is contained in:
Peter Geoghegan
2019-03-29 12:29:05 -07:00
parent d85e0f366a
commit 9c7fb7e6d8
4 changed files with 11 additions and 11 deletions
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3
src/backend/access/nbtree/nbtsearch.c
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@@ -182,7 +182,8 @@ _bt_search(Relation rel, BTScanInsert key, Buffer *bufP, int access,
/*
* If we're asked to lock leaf in write mode, but didn't manage to, then
* relock. That may happen when the root page appears to be leaf.
* relock. This should only happen when the root page is a leaf page (and
* the only page in the index other than the metapage).
*/
if (access == BT_WRITE && page_access == BT_READ)
{

6
src/backend/access/nbtree/nbtsort.c
View File

@@ -835,7 +835,7 @@ _bt_buildadd(BTWriteState *wstate, BTPageState *state, IndexTuple itup)
* the limit on the size of tuples inserted on the leaf level by the same
* small amount. Enforce the new v4+ limit on the leaf level, and the old
* limit on internal levels, since pivot tuples may need to make use of
* the resered space. This should never fail on internal pages.
* the reserved space. This should never fail on internal pages.
*/
if (unlikely(itupsz > BTMaxItemSize(npage)))
_bt_check_third_page(wstate->index, wstate->heap,
@@ -907,8 +907,8 @@ _bt_buildadd(BTWriteState *wstate, BTPageState *state, IndexTuple itup)
* choosing a split point here for a benefit that is bound to be
* much smaller.
*
* Since the truncated tuple is probably smaller than the
* original, it cannot just be copied in place (besides, we want
* Since the truncated tuple is often smaller than the original
* tuple, it cannot just be copied in place (besides, we want
* to actually save space on the leaf page). We delete the
* original high key, and add our own truncated high key at the
* same offset. It's okay if the truncated tuple is slightly