xiaodongzhang created KYLIN-3883:
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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。
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