Shai Erera created LUCENE-5215:
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Summary: Add support for FieldInfos generation
Key: LUCENE-5215
URL: https://issues.apache.org/jira/browse/LUCENE-5215
Project: Lucene - Core
Issue Type: New Feature
Components: core/index
Reporter: Shai Erera
Assignee: Shai Erera
In LUCENE-5189 we've identified few reasons to do that:
# If you want to update docs' values of field 'foo', where 'foo' exists in the
index, but not in a specific segment (sparse DV), we cannot allow that and have
to throw a late UOE. If we could rewrite FieldInfos (with generation), this
would be possible since we'd also write a new generation of FIS.
# When we apply NDV updates, we call DVF.fieldsConsumer. Currently the consumer
isn't allowed to change FI.attributes because we cannot modify the existing
FIS. This is implicit however, and we silently ignore any modified attributes.
FieldInfos.gen will allow that too.
The idea is to add to SIPC fieldInfosGen, add to each FieldInfo a dvGen and add
support for FIS generation in FieldInfosFormat, SegReader etc., like we now do
for DocValues. I'll work on a patch.
Also on LUCENE-5189, Rob raised a concern about SegmentInfo.attributes that
have same limitation -- if a Codec modifies them, they are silently being
ignored, since we don't gen the .si files. I think we can easily solve that by
recording SI.attributes in SegmentInfos, so they are recorded per-commit. But I
think it should be handled in a separate issue.
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