MakeChecker initializes a new Checker.

Data indicates that at least a key or range in the level overlaps with the key range of interest.

None indicates that the key range of interest doesn't overlap any tables on the level.

OnlyBoundary indicates that there is boundary overlap but no data overlap.

Checker is used to check for data overlap between tables in the LSM and a user key region of interest.

WithLevel is the result of checking overlap against an LSM level.

IteratorFactory is an interface that is used by the Checker to create iterators for a given table.

Kind indicates the kind of overlap detected between a key range and a level.

WithLSM stores the result of checking for boundary and data overlap between a region of key space and the LSM levels, starting from the top (L0) and stopping at the highest level with data overlap.