xiaodongzhang created KYLIN-3883: ------------------------------------ Summary: Kylin supports column count aggregation Key: KYLIN-3883 URL: https://issues.apache.org/jira/browse/KYLIN-3883 Project: Kylin Issue Type: New Feature Components: Job Engine Affects Versions: all Reporter: xiaodongzhang Assignee: xiaodongzhang Fix For: v3.0.0
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。 -- This message was sent by Atlassian JIRA (v7.6.3#76005)