Github user watermen commented on the issue:
https://github.com/apache/incubator-carbondata/pull/659
@kumarvishal09
1. In the driver side, one segment has n(the number of nodes)
SegmentProperties objects. You can see the `SegmentTaskIndexStore.loadBlocks`
or ask @QiangCai for detail.
2. In the executor side, we can't just remain one SegmentProperties object
each segment, because tasks in same segment will run on the different executor,
means different progress.
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