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Posted to issues@kylin.apache.org by GitBox <gi...@apache.org> on 2019/03/18 05:58:02 UTC

[GitHub] [kylin] xbirbird opened a new pull request #528: KYLIN-3883 Kylin supports column count aggregation

xbirbird opened a new pull request #528: KYLIN-3883 Kylin supports column count aggregation
URL: https://github.com/apache/kylin/pull/528
 
 
   Kylin目前只支持对常量1进行count聚合预计算，即count(1)，count(col_1)的查询内部全部重写到对count(1)的查询，这样会导致一个问题：当col_1列中存在null值时，count(col_1)的查询结果并不准确。这样就导致Kylin的查询结果和Hive、Spark等不一致。该Patch中，提供了对count(col_1)的支持。

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