[LUCENE-4250] PayloadFunction explains are trappy and duplicate the scoring

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0-BETA, 6.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Robert Muir
• Created: 23/Jul/12 22:01
• Updated: 28/Aug/22 13:22
• Resolved: 25/Jul/12 23:36

Description

the default implementation is basically never useful:

result.setDescription("Unimpl Payload Function Explain");
result.setValue(1);

Instead we should just do this:

result.setDescription(getClass().getSimpleName() + ".docScore()");
result.setValue(docScore(docId, field, numPayloadsSeen, payloadScore));

And remove all the overriden impls in our Min/Max/Avg that just
duplicate their scoring function.