[jira] [Created] (LUCENE-8050) PerFieldDocValuesFormat's merge should not grab field DVF if DocValuesType.NONE

["David Smiley (JIRA)" <ji...@apache.org>]

David Smiley created LUCENE-8050:
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             Summary: PerFieldDocValuesFormat's merge should not grab field DVF if DocValuesType.NONE
                 Key: LUCENE-8050
                 URL: https://issues.apache.org/jira/browse/LUCENE-8050
             Project: Lucene - Core
          Issue Type: Improvement
          Components: core/index
    Affects Versions: 6.3
            Reporter: David Smiley
            Assignee: David Smiley


Since LUCENE-7456 (Lucene 6.3), PerFieldDocValuesFormat delegates the merge to the actual field DVF's merge.  Great, but unfortunately it will call {{getDocValuesFormatForField}} on all fields (in FieldInfos) even those that have no DocValues (DocValuesType.NONE).  It won't ultimately actually write anything to those DVFs but there may be some overhead and furthermore it's now more awkward to write a subclass of PFDVF that deliberately throws an exception from {{getDocValuesFormatForField}} for some fields.

AFAICT this appears to be a non-issue for PerFieldPostingsFormat's merge because it's use of MultiFields filters out IndexOptions.NONE



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