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https://issues.apache.org/jira/browse/FLINK-11711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16774037#comment-16774037
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godfrey he commented on FLINK-11711:
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hi [~f.pompermaier], thanks for your suggestion.
It seems that https://github.com/okkam-it/flink-descriptive-stats is
inaccessible.
We want to build a basic Blink planner first. After that we can take them into
account.
> 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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