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https://issues.apache.org/jira/browse/OAK-2315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Mueller updated OAK-2315:
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Summary: Index cost is sometimes negative (index type "property") (was:
Index cost is sometimes negative)
> Index cost is sometimes negative (index type "property")
> --------------------------------------------------------
>
> Key: OAK-2315
> URL: https://issues.apache.org/jira/browse/OAK-2315
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: core, query
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Fix For: 1.0.9, 1.1.3
>
>
> The property index can return a negative cost in the following case:
> * It is a non-unique index (the default)
> * The "entryCount" is set to lower than 10000
> * The "keyCount" property is not set, or set to 0
> * The index matches
> In this case, the following formula is used and returns a negative value:
> {noformat}
> (long) ((double) count / keyCount) + size;
> {noformat}
> Count is for example 500, keyCount is 0. The division evaluates to infinity,
> which is converted to Long.MAX_VALUE. Size is larger than 0, so there is an
> overflow to negative.
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