For a bit more info, what about various storage engines over MySQL releases. Have they changed much? Here we’re looking at the storage/X/ directory for code, so for some engines this excludes the handler that interfaces with the MySQL Server.
You can view the data on the spreadsheet.
So Jonas pointed out that the NDB kernel hasn’t changed too much in size over releases. Let’s have a look:
In fact, the size went down slightly from 4.1 to 5.0. In this, 6.4 and 7.0 are the same thing but appear twice for completeness.
You can see the raw results in the spreadsheet here.