[LUCENE-7456] PerField(DocValues|Postings)Format do not call the per-field merge methods

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 6.2.1
• Fix Version/s: 6.3, 7.0
• Component/s: core/codecs
• Lucene Fields: New, Patch Available
• Assignee: Unassigned
• Reporter: Julien Massenet
• Created: 21/Sep/16 15:04
• Updated: 28/Aug/22 15:03
• Resolved: 04/Oct/16 15:53

Description

While porting some old codec code from Lucene 4.3.1, I couldn't get the per-field formats to call upon the per-field merge methods; the default merge method was always being called.

I think this is a side-effect of LUCENE-5894.

Attached is a patch with a test that reproduces the error and an associated fix that pass the unit tests.

Issue Links

• relates to: LUCENE-8050 PerFieldDocValuesFormat's merge should not grab field DVF if DocValuesType.NONE