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https://issues.apache.org/jira/browse/CALCITE-5649?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adam Kennedy updated CALCITE-5649:
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    Fix Version/s: 1.35.0

> Produce row count statistics from ReflectiveSchema for array based tables
> -------------------------------------------------------------------------
>
>                 Key: CALCITE-5649
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5649
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.34.0
>            Reporter: Adam Kennedy
>            Assignee: Adam Kennedy
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.35.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When testing new Calcite implementations it is easy to use (and several 
> online examples indeed use) a trivial reflected synthetic schema such as the 
> following:
> {code:java}
>     public Schema getSchema() {
>         return new ReflectiveSchema(new PeopleSchema());
>     }
>     public static final class PeopleSchema {
>         public final Person[] heroes = {
>                 new Person("Ironman", 12),
>                 new Person("Batman", 10)
>         };
>         public static class Person {
>             public final String name;
>             public final int age;
>             public Person(final String name, final int age) {
>                 this.name = name;
>                 this.age = age;
>             }
>         }
>     }
> {code}
> While this works for some basics, the lack of statistics makes it less useful 
> than it could be. While not all variations supported by ReflectiveSchema can 
> easily capture statistics, the variation which provides the table as an array 
> has trivial access to a valid RowCount value.
> For these simple cases ReflectiveSchema should provide a Statistic object 
> with a valid row count so the simple synthetic schemas will be more useful.



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