ETS driver impl. Receives the {kura_ets, Plan} terms emitted by kura_ets_dialect in place of SQL and executes them via kura_ets_query.

Result shape

Returns #{rows := Rows, num_rows := N, command := C} to match kura_driver_pgo's shape. Rows are maps keyed by atom field names.

Raw SQL

Anything that reaches the driver as actual SQL bytes (raw kura_repo_worker:query/3, migrations, kura's built-in many_to_many join-row persistence, optimistic-lock updates) is rejected with {error, {kura_ets, raw_sql_unsupported}} — there is no SQL engine here.

Transactions

ETS has no transactions. transaction/4 simply runs the fun: queries inside it hit the tables directly, and there is no rollback on error. The backend deliberately does not declare the transactions capability.