Does Terracotta (TSA) use disk-based index for BigMemory SQL queries?

Hi,

As you are aware, we can use BigMemory SQL (either using ANSI standard SQL or through Query API) over Terracotta caches (including distributed).

For these SQL queries, does Terracotta use disk-based indexes for Searchable caches? Or are these indexes also stored in cache (L2, if TSA is being used)?

Thank you.