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mdb_drop0(): Omit scanning DUPSORT sub-DB leaves

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This commit is contained in:
Hallvard Furuseth 2015-07-04 13:48:02 +02:00
parent f702e33b6c
commit b6ac0cd90a
1 changed files with 4 additions and 2 deletions
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6
libraries/liblmdb/mdb.c
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@ -9470,8 +9470,10 @@ mdb_drop0(MDB_cursor *mc, int subs)
MDB_cursor mx; MDB_cursor mx;
unsigned int i; unsigned int i;
/* LEAF2 pages have no nodes, cannot have sub-DBs */ /* DUPSORT sub-DBs have no ovpages/DBs. Omit scanning leaves.
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) * This also avoids any P_LEAF2 pages, which have no nodes.
*/
if (mc->mc_flags & C_SUB)
mdb_cursor_pop(mc); mdb_cursor_pop(mc);
mdb_cursor_copy(mc, &mx); mdb_cursor_copy(mc, &mx);