[OAK-6902] Cost estimation for path tranformable queries is incorrect

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.7.11, 1.8.0
• Component/s: lucene
• Assignee: Vikas Saurabh
• Reporter: Vikas Saurabh
• Created: 02/Nov/17 20:43
• Updated: 13/Nov/17 13:55
• Resolved: 02/Nov/17 21:19

Description

OAK-6735 introduced cost calculation based on number of documents indexed per term. But, it miscalculates cost as 0 for relative properties which are queried on an nt:base based index while tranforming paths

e.g. index:

+ index
  + indexRules/nt:base/properties/foo
      - name = foo
      - propertyIndex = true

and query

SELECT * FROM [nt:base] WHERE [a/foo] = 'bar'

Issue Links

• is broken by: OAK-6735 Lucene Index: improved cost estimation by using document count per field