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https://issues.apache.org/jira/browse/CALCITE-501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14239924#comment-14239924
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Vladimir Sitnikov commented on CALCITE-501:
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{quote} #2 you could give a custom metadata provider for stats,{quote}
Thanks. I did not know that exists.
{quote}So I don't blame you for taking an easier path!{quote}
What is the alternative? I do not follow you.
Do you mean "deduce the statistics" based on trial and error basis? (e.g.
collect it as a side effect of performing queires)
{quote} programming languages work with no stats, but (comparatively recently)
have stats for JIT{quote}
Well, there is a well-known "profile guided optimization" approach for
non-JITted languages. It applies profile information for statically compiled
language.
> Implement indexed access paths in ReflectiveSchema
> --------------------------------------------------
>
> Key: CALCITE-501
> URL: https://issues.apache.org/jira/browse/CALCITE-501
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.0.0-incubating
> Reporter: Vladimir Sitnikov
> Assignee: Julian Hyde
>
> {{ReflectiveSchema}} is not able to perform indexed scan of a particular
> collection.
> It would be nice if it could find rows by a given key.
> This would demonstrate the way to implement indexed access path in Calcite:
> rules, filter matching.
> The sketch API can be as follows:
> {code:java}
> public static class CatchallSchema {
> public final Employee[] employees = {
> new Employee(1, 10, "A", 0f, null),
> new Employee(2, 10, "Ab", 0f, null),
> new Employee(3, 10, "Abc", 0f, null),
> new Employee(4, 10, "Abd", 0f, null),
> };
> // Return the data
> public Employee[] findEmployeesByName(String name);
> // or
> // List of indices into "employees" collection
> public int[] findEmployeesByName(String name);
> }
> {code}
> Alternative solution is to treat {{Map/SortedMap}} somehow in a special way.
> {code:java}
> // When Filter(name=?, Scan) can be transformed to MapGet(name=?)
> public Map<String, Employee> employees;
> {code}
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