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https://issues.apache.org/jira/browse/FLINK-11711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775123#comment-16775123
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Flavio Pompermaier commented on FLINK-11711:
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Also [https://github.com/addthis/stream-lib/] could very inspiring when the
implementation phase will start
> 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 & SQL
> Reporter: godfrey he
> Assignee: godfrey he
> Priority: Major
>
> 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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