[OAK-8487] When query with OR is divided into union of queries, orderings are lost

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.14.0
• Component/s: core
• Assignee: Unassigned
• Reporter: Piotr Tajduś
• Created: 15/Jul/19 15:17
• Updated: 15/Jul/19 15:17

Description

In org.apache.jackrabbit.oak.query.QueryImpl.buildAlternativeQuery() orderings are not passed into subqueries, nor into new UnionQueryImpl (it not only affects order, but in some cases cost of plans - in my case it caused index traversing).

I have fixed this in my copy of sources by setting orderings on result:

result = newAlternativeUnionQuery(left, right);
result.setOrderings(orderings);
}
}
return result;