object: Add LINK object type

This commit makes it easier to differ link objects from the other types. Object
split hierarchy rework increases the link object's structure and makes it
more strictly formatted, so now it plays a more important role in the split
chains (and the split rules became more complex too).

Signed-off-by: Pavel Karpy <[email protected]>

Author: carpawell

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Numeric operands for object search queries (#265)
 - Link object payload message (#263)
 - Children sizes index to the link objects (#264)
+- `LINK` split chain object type (#283)
 
 ### Changed
 

object/types.proto

@@ -17,6 +17,7 @@ import "session/types.proto";
 // * TOMBSTONE
 // * STORAGE_GROUP
 // * LOCK
+// * LINK
 enum ObjectType {
   // Just a normal object
   REGULAR = 0;
@@ -29,6 +30,9 @@ enum ObjectType {
 
   // Object lock
   LOCK = 3;
+
+  // Object that stores child object IDs for the split objects.
+  LINK = 4;
 }
 
 // Type of match expression

proto-docs/object.md

@@ -1043,13 +1043,15 @@ String presentation of object type is the same as definition:
 * TOMBSTONE
 * STORAGE_GROUP
 * LOCK
+* LINK
 
 | Name | Number | Description |
 | ---- | ------ | ----------- |
 | REGULAR | 0 | Just a normal object |
 | TOMBSTONE | 1 | Used internally to identify deleted objects |
 | STORAGE_GROUP | 2 | StorageGroup information |
 | LOCK | 3 | Object lock |
+| LINK | 4 | Object that stores child object IDs for the split objects. |
 
 
  <!-- end enums -->