imay opened a new issue #1384: Add new SegmentIterator URL: https://github.com/apache/incubator-doris/issues/1384 according to #1382 , we should implement a new `SegmetIterator` for new format segment. This class will leverage statistics information and bloom filter to reduce data load. If we add secondary index such as Bitmap, this class will use it. However, If this class don't use filter to reduce loading data, the result would be correct. Only the performance will be poor. So, before other part is implemented, we can implement a version which only can work correctly while performance is poor. relate to #1305
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