sql+storage: table copy using INSERT ... SELECT yields large range that isn't split

Running on rc1 presumably (to be checked)

Scenario:

- multiple issues of `INSERT INTO ... SELECT ...`  to populate a new table using data from another
- the new table grows to 1.8GB
- the admin UI shows that tables has only 1 range (!!)

Expected: the table is split into multiple ranges as the INSERTs are processed.


