- Fix bug causing bnx base wrong after CheckMemory

  Add negative array indexes starting from the last
  modified:   storage/connect/bson.cpp
  modified:   storage/connect/bsonudf.cpp
  modified:   storage/connect/json.cpp

storage/connect/bson.cpp

@@ -1138,6 +1138,9 @@ PBVAL BJSON::GetArrayValue(PBVAL bap, int n)
   CheckType(bap, TYPE_JAR);
   int i = 0;
 
+  if (n < 0)
+    n += GetArraySize(bap);
+
   for (PBVAL bvp = GetArray(bap); bvp; bvp = GetNext(bvp), i++)
     if (i == n)
       return bvp;

storage/connect/bsonudf.cpp

@@ -3707,6 +3707,7 @@ char *bson_get_item(UDF_INIT *initid, UDF_ARGS *args, char *result,
 			PUSH_WARNING("CheckMemory error");
 			goto fin;
 		} else {
+			bnx.Reset();
 			jvp = bnx.MakeValue(args, 0, true);
 
 			if (g->Mrr) {			 // First argument is a constant
@@ -4052,6 +4053,7 @@ double bsonget_real(UDF_INIT *initid, UDF_ARGS *args,
 			*is_null = 1;
 			return 0.0;
 		} else {
+			bnx.Reset();
 			jvp = bnx.MakeValue(args, 0);
 
 			if ((p = bnx.GetString(jvp))) {

storage/connect/json.cpp

@@ -58,11 +58,19 @@ char *GetJsonNull(void);
 /***********************************************************************/
 /* IsNum: check whether this string is all digits.                     */
 /***********************************************************************/
-bool IsNum(PSZ s) {
-  for (char* p = s; *p; p++)
+bool IsNum(PSZ s)
+{
+  char* p = s;
+
+  if (*p == '-')
+    p++;
+
+  if (*p == ']')
+    return false;
+  else for (; *p; p++)
     if (*p == ']')
       break;
-    else if (!isdigit(*p) || *p == '-')
+    else if (!isdigit(*p))
       return false;
 
   return true;
@@ -1257,6 +1265,8 @@ PJVAL JARRAY::GetArrayValue(int i)
 {
   if (Mvals && i >= 0 && i < Size)
     return Mvals[i];
+  else if (Mvals && i < 0 && i >= -Size)
+    return Mvals[Size + i];
   else
     return NULL;
 } // end of GetValue