StreamRange getStreamRange(Long streamId) {
            StreamCache streamCache = map.get(streamId);
            if (streamCache == null) {
                return new StreamRange(NOOP_OFFSET, NOOP_OFFSET);
            } else {
                return streamCache.range();
            }
        }
Merge the right block to the left block
s3stream/src/main/java/com/automq/stream/s3/cache/LogCache.java