[GitHub] [incubator-doris] imay opened a new pull request #1515: Add storage rowwise iterator

[GitBox <gi...@apache.org>]

imay opened a new pull request #1515: Add storage rowwise iterator
URL: https://github.com/apache/incubator-doris/pull/1515
 
 
   Use RowwiseIterator to uniform all data fetch in storage engine.
   All objects in storage engine can be read in iterator format.
   For example: Segment, Rowset.
   
   This patch impelement two generic iterators: UnionRowwiseIterator,
   MergeRowwiseIterator. These two class will add iterator as its inputs.
   
   To implement iterators, we define a new class RowBlockV2, all data read
   from iterator is in this format. We define a new class other than use
   old version's RowBlock is because we want to keep old code work
   normally.

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