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https://issues.apache.org/jira/browse/OAK-5980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davide Giannella updated OAK-5980:
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Fix Version/s: (was: 1.12.0)
> Bad Join Query Plan Used
> ------------------------
>
> Key: OAK-5980
> URL: https://issues.apache.org/jira/browse/OAK-5980
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: query
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Priority: Major
> Fix For: 1.14.0
>
>
> For a join query, where selectors are joined over ischildnode but also can
> use an index,
> the selectors sometimes use the index instead of the much less
> expensive parent join. Example:
> {noformat}
> select [a].* from [nt:unstructured] as [a]
> inner join [nt:unstructured] as [b] on ischildnode([b], [a])
> inner join [nt:unstructured] as [c] on ischildnode([c], [b])
> inner join [nt:unstructured] as [d] on ischildnode([d], [c])
> inner join [nt:unstructured] as [e] on ischildnode([e], [d])
> where [a].[classname] = 'letter'
> and isdescendantnode([a], '/content')
> and [c].[classname] = 'chapter'
> and localname([b]) = 'chapters'
> and [e].[classname] = 'list'
> and localname([d]) = 'lists'
> and [e].[path] = cast('/content/abc' as path)
> {noformat}
> The order of selectors is sometimes wrong (not e, d, c, b, a), but
> more importantly, selectors c and a use the index on className.
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