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https://issues.apache.org/jira/browse/JENA-1757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928438#comment-16928438
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Andy Seaborne commented on JENA-1757:
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The [PR#604|https://github.com/apache/jena/pull/604] an illustration at the
moment and it woudkl need the tests cleaning up to be suitable for merging.
> Deprecate GraphStatisticsHandler
> --------------------------------
>
> Key: JENA-1757
> URL: https://issues.apache.org/jira/browse/JENA-1757
> Project: Apache Jena
> Issue Type: Task
> Components: Core
> Affects Versions: Jena 3.12.0
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Graph statistics give the number of for "S P O" where S, P or O can be a
> wildcard.
> This didn't quite work out for query optimization - the needs for
> optimization are a little more complicated, needing information such as "if S
> is going to fixed, estimate the number of "S P O" with out yet knowing what S
> is fixed as, or it might be one of several values.
> The only significant implementation is \{{GraphMemStatisticsHandler}} for the
> plain memory graphs. It does exploit the mem indexes to get the count,
> compared to counting a "find" but the improvement appears to be small.
> Proposal: deprecate {{GraphStatisticsHandler}}, retain the mem code "just in
> case".
> This will clear the way for either removal or incompatible change in the
> future.
>
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