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Posted to dev@calcite.apache.org by "Chunwei Lei (Jira)" <ji...@apache.org> on 2020/09/03 07:36:00 UTC

[jira] [Created] (CALCITE-4223) Introducing column statistics to RelOptTable

Chunwei Lei created CALCITE-4223:
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             Summary: Introducing column statistics to RelOptTable
                 Key: CALCITE-4223
                 URL: https://issues.apache.org/jira/browse/CALCITE-4223
             Project: Calcite
          Issue Type: Improvement
            Reporter: Chunwei Lei


Many systems depend on column statistics to compute more accurate stats, such as NDV, average column size, and so on. It would be nice if Calcite can provide such an interface.

Column statistics might include NDV, average/max column length, number of nulls, number of trues, number of falses and so on. 

What do you think?

 



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