[jira] [Commented] (FLINK-13611) Introduce analyze statistic utility to generate table & column statistics

["godfrey he (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-13611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16901880#comment-16901880 ] 

godfrey he commented on FLINK-13611:
------------------------------------

i would like to take this ticket

> Introduce analyze statistic utility to generate table & column statistics
> -------------------------------------------------------------------------
>
>                 Key: FLINK-13611
>                 URL: https://issues.apache.org/jira/browse/FLINK-13611
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table SQL / Planner
>            Reporter: godfrey he
>            Priority: Major
>             Fix For: 1.10.0
>
>
> this issue aims to introduce a utility class to generate table & column statistics, the main steps include: 
> 1. generate sql, like {{select approx_count_distinct(a) as ndv, count(1) - count(a) as nullCount, avg(char_length(a)) as avgLen, max(char_lenght(a)) as maxLen, max(a) as maxValue, min(a) as minValue, ... from MyTable }}
> 2. execute the query
> 3. convert to the result to {{TableStats}} (maybe the source table is not a catalog table)
> 4. convert to {{TableStats}} to {{CatalogTableStatistics}} if needed
> This issue does not involve DDL, however the DDL could use this utility class once it's supported.



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