Optionalcreate_Optionalkeykey is the subject key for the comparison operation.
Optionalleaselease is the lease id of the given key.
Optionalmod_mod_revision is the last modified revision of the given key.
Optionalrange_range_end compares the given target to all keys in the range [key, range_end). See RangeRequest for more details on key ranges.
Optionalresultresult is logical comparison operation for this comparison.
Optionaltargettarget is the key-value field to inspect for the comparison.
Optionalvaluevalue is the value of the given key, in bytes.
Optionalversionversion is the version of the given key
create_revision is the creation revision of the given key