[jira] [Created] (LUCENE-10357) Ghost fields and postings/points

["Adrien Grand (Jira)" <ji...@apache.org>]

Adrien Grand created LUCENE-10357:
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             Summary: Ghost fields and postings/points
                 Key: LUCENE-10357
                 URL: https://issues.apache.org/jira/browse/LUCENE-10357
             Project: Lucene - Core
          Issue Type: Task
            Reporter: Adrien Grand


On doc values and norms, we require that codec APIs return non-null empty instances on fields that have the feature turned on on their FieldInfo, even if all values have been merged away.

However postings and points have the choice: they may either return empty instances or {{null}}. See e.g. {{BasePostingsFormatTestCase#testGhosts}} for instance.

I fear that this could be a source of bugs, as a caller could be tempted to assume that he would get non-null terms on a FieldInfo that has IndexOptions that are not NONE. Should we introduce a contract that FieldsProducer (resp. PointsReader) must return a non-null instance when postings (resp. points) are indexed?



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