diff options
Diffstat (limited to 'src/backend/access/nbtree/nbtutils.c')
| -rw-r--r-- | src/backend/access/nbtree/nbtutils.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/src/backend/access/nbtree/nbtutils.c b/src/backend/access/nbtree/nbtutils.c index 7a18fcf0abb..ddd59444e28 100644 --- a/src/backend/access/nbtree/nbtutils.c +++ b/src/backend/access/nbtree/nbtutils.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/access/nbtree/nbtutils.c,v 1.67 2005/12/07 19:37:53 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/access/nbtree/nbtutils.c,v 1.68 2006/01/17 00:09:01 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -23,7 +23,7 @@ /* * _bt_mkscankey - * Build a scan key that contains comparison data from itup + * Build an insertion scan key that contains comparison data from itup * as well as comparator routines appropriate to the key datatypes. * * The result is intended for use with _bt_compare(). @@ -67,11 +67,12 @@ _bt_mkscankey(Relation rel, IndexTuple itup) /* * _bt_mkscankey_nodata - * Build a scan key that contains comparator routines appropriate to - * the key datatypes, but no comparison data. The comparison data - * ultimately used must match the key datatypes. + * Build an insertion scan key that contains 3-way comparator routines + * appropriate to the key datatypes, but no comparison data. The + * comparison data ultimately used must match the key datatypes. * - * The result cannot be used with _bt_compare(). Currently this + * The result cannot be used with _bt_compare(), unless comparison + * data is first stored into the key entries. Currently this * routine is only called by nbtsort.c and tuplesort.c, which have * their own comparison routines. */ @@ -160,7 +161,7 @@ _bt_formitem(IndexTuple itup) /*---------- * _bt_preprocess_keys() -- Preprocess scan keys * - * The caller-supplied keys (in scan->keyData[]) are copied to + * The caller-supplied search-type keys (in scan->keyData[]) are copied to * so->keyData[] with possible transformation. scan->numberOfKeys is * the number of input keys, so->numberOfKeys gets the number of output * keys (possibly less, never greater). @@ -485,7 +486,7 @@ _bt_preprocess_keys(IndexScanDesc scan) * accordingly. See comments for _bt_preprocess_keys(), above, about how * this is done. * - * scan: index scan descriptor + * scan: index scan descriptor (containing a search-type scankey) * page: buffer page containing index tuple * offnum: offset number of index tuple (must be a valid item!) * dir: direction we are scanning in |