Own stages in explain
What changes in Own stages in explain compared with MongoDB and what your application has to do.
This difference is of the Extension kind.
What MongoDB does
explain shows only MongoDB stages.
What TeselaDB does
explain adds its own stages: the merge of index buckets, the ranges touched, the split across ranges and spills to disk.
What your application has to do
If a program reads the output of explain, make it ignore the stages it does not know.