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-rw-r--r--erts/emulator/beam/erl_db_tree.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/erts/emulator/beam/erl_db_tree.c b/erts/emulator/beam/erl_db_tree.c
index fed5298e44..da2696163a 100644
--- a/erts/emulator/beam/erl_db_tree.c
+++ b/erts/emulator/beam/erl_db_tree.c
@@ -1081,11 +1081,12 @@ static int db_select_continue_tree(Process *p,
static int db_select_tree(Process *p, DbTable *tbl,
Eterm pattern, int reverse, Eterm *ret)
{
+ /* Strategy: Traverse backwards to build resulting list from tail to head */
DbTableTree *tb = &tbl->tree;
DbTreeStack* stack;
struct select_context sc;
struct mp_info mpi;
- Eterm lastkey = NIL;
+ Eterm lastkey = THE_NON_VALUE;
Eterm key;
Eterm continuation;
unsigned sz;
@@ -1293,7 +1294,7 @@ static int db_select_count_tree(Process *p, DbTable *tbl,
DbTreeStack* stack;
struct select_count_context sc;
struct mp_info mpi;
- Eterm lastkey = NIL;
+ Eterm lastkey = THE_NON_VALUE;
Eterm key;
Eterm continuation;
unsigned sz;
@@ -1395,7 +1396,7 @@ static int db_select_chunk_tree(Process *p, DbTable *tbl,
DbTreeStack* stack;
struct select_context sc;
struct mp_info mpi;
- Eterm lastkey = NIL;
+ Eterm lastkey = THE_NON_VALUE;
Eterm key;
Eterm continuation;
unsigned sz;
@@ -1636,7 +1637,7 @@ static int db_select_delete_tree(Process *p, DbTable *tbl,
DbTableTree *tb = &tbl->tree;
struct select_delete_context sc;
struct mp_info mpi;
- Eterm lastkey = NIL;
+ Eterm lastkey = THE_NON_VALUE;
Eterm key;
Eterm continuation;
unsigned sz;
@@ -2624,7 +2625,7 @@ static void traverse_backwards(DbTableTree *tb,
{
TreeDbTerm *this, *next;
- if (lastkey == NIL) {
+ if (lastkey == THE_NON_VALUE) {
stack->pos = stack->slot = 0;
if (( this = tb->root ) == NULL) {
return;
@@ -2662,7 +2663,7 @@ static void traverse_forward(DbTableTree *tb,
{
TreeDbTerm *this, *next;
- if (lastkey == NIL) {
+ if (lastkey == THE_NON_VALUE) {
stack->pos = stack->slot = 0;
if (( this = tb->root ) == NULL) {
return;