godfrey he created FLINK-13611:
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Summary: 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
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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