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Posted to commits@doris.apache.org by GitBox <gi...@apache.org> on 2020/08/20 02:28:38 UTC

[GitHub] [incubator-doris] blackfox1983 commented on issue #3930: [Proposal] Doris support version column for REPLACE aggregate type

blackfox1983 commented on issue #3930:
URL: https://github.com/apache/incubator-doris/issues/3930#issuecomment-676858206


   有两个场景，麻烦看下：
   1、是否支持Aggregate表？即表中有replace(replace_if_not_null)聚合模式以及其他聚合模式。
   2、如果表中有多个replace/replace_if_not_null列，不同列的更新版本是不同的。这类的如何支持？是否要针对列做版本
   
   如表字段为key1, v1(replace）, v2(replace_if_not_null)
   几行数据（默认为大的覆盖小的，如v1.2 可以替换v1.0、v1.1）
   k1, v1.1, (NULL)  => 表数据为k1, v1.1, null
   k1, v1.0, v2.1   => 表数据为 k1, v1.1, v2.1
   k1, v1.3, v2.0  => 表数据为 k1, v1.3, v2.1
   这个的背景是不同的字段的版本时间不同（业务上一般拿数据生产时间作为版本，不同的字段由于在多个数据流计算，导致生产时间不一致）
   


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