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Posted to dev@flink.apache.org by "Yunhong Zheng (Jira)" <ji...@apache.org> on 2022/08/16 08:43:00 UTC
[jira] [Created] (FLINK-28992) Change Ndv takes the max value instead of sum of all partitions when getting partition table column stats
Yunhong Zheng created FLINK-28992:
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Summary: Change Ndv takes the max value instead of sum of all partitions when getting partition table column stats
Key: FLINK-28992
URL: https://issues.apache.org/jira/browse/FLINK-28992
Project: Flink
Issue Type: Bug
Components: Table SQL / Planner
Affects Versions: 1.16.0
Reporter: Yunhong Zheng
Fix For: 1.16.0
Now, when we obtain column statistics Ndv of the partition table, we use the method of taking sum of Ndv of all partitions, which will cause the obtained stats to be far from the real stats. So now we take the max value instead of sum of all partitions.
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