[jira] [Updated] (IGNITE-14846) Default statistics

["Yury Gerzhedovich (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-14846?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yury Gerzhedovich updated IGNITE-14846:
---------------------------------------
    Labels: calcite2-required calcite3-required  (was: )

> Default statistics
> ------------------
>
>                 Key: IGNITE-14846
>                 URL: https://issues.apache.org/jira/browse/IGNITE-14846
>             Project: Ignite
>          Issue Type: Improvement
>          Components: sql
>            Reporter: Alexander Belyak
>            Priority: Major
>              Labels: calcite2-required, calcite3-required
>
> To simplify optimizer and to get a little bit more accurate estimation Ignite can generate some default statistics for each table (each column and so on) based on tables metadata. For example:
> boolean non null field can produce a following statistics:
> min: false
> max: true
> nulls: 0
> distinct: 2
> total: <table_size>
> while
> uuid nullable column can produce:
> min: 00-00-00-00...
> max: FF-FF-FF-...
> nulls: <table_size> * 0.1
> distinct: <table_size> * 0.5
> total: <table size>
> It can be generated on the fly by statistics subsystem (and cached for future usages).



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