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Posted to issues@flink.apache.org by "godfrey he (JIRA)" <ji...@apache.org> on 2019/02/21 09:02:00 UTC

[jira] [Created] (FLINK-11711) Add table and column stats

godfrey he created FLINK-11711:
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             Summary: Add table and column stats
                 Key: FLINK-11711
                 URL: https://issues.apache.org/jira/browse/FLINK-11711
             Project: Flink
          Issue Type: New Feature
          Components: Table API &amp; SQL
            Reporter: godfrey he
            Assignee: godfrey he


We define two structure mode to hold statistics


1. TableStats: statistics for table level, contains 2 elements:

rowCount: Long // the number of row count of table

colStats: Map[String, ColumnStats] // map each column to its ColumnStats


2. ColumnStats: statistics for column level, contains 6 elements:

ndv: Long // number of distinct values

nullCount: Long // number of null values

avgLen: Double // average length of column values

maxLen: Integer // max length of column values

max: Any // max value of column values

min: Any // min value of column values



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