[ https://issues.apache.org/jira/browse/JENA-1757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andy Seaborne resolved JENA-1757. --------------------------------- Fix Version/s: Jena 3.13.0 Resolution: Done > 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 > Fix For: Jena 3.13.0 > > Time Spent: 1h 20m > 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. > -- This message was sent by Atlassian Jira (v8.3.4#803005)