what's CCoinsViewDB::GetHeadBlocks for?

what's CCoinsViewDB::GetHeadBlocks for?

I have google a lot, there exists little information, confused with the code comments

Retrieve the range of blocks that may have been only partially written. If the database is in a consistent state, the result is the empty vector. Otherwise, a two-element vector is returned consisting of the new and the old block hash, in that order.
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