kangpinghuang opened a new issue #2245: support online upgrade from alpha rowset to beta rowset URL: https://github.com/apache/incubator-doris/issues/2245 In order to support dictionary encoding and bitmap index, we develop new file storage format: segment_v2(#1305 ), and add a new Rowset type: BetaRowset based on the new format. To support online upgrade from alpha rowset to beta rowset, there are several problems should be resolved: - add a mechanism for new created table to specify which storage type to use(alpha or beta) - add a mechanism to change the new loaded rowset's type to BetaRowset for old table - add a mechanism to convert AlphaRowsets in table to BetaRowset(one method is setting the dst rowset type of compaction) - get the rowset statistics of rowset of all table
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