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https://issues.apache.org/jira/browse/LUCENE-8601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16730866#comment-16730866
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Murali Krishna P commented on LUCENE-8601:
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Thanks Mike,
regarding the assertion, i indeed first attempted to assert for equals, but the
unit tests fail. The segment suffix supposed to change after merge and also
there is backward compatibility test for merging from an old format where you
have to write a new format. So, the assertion did not make sense and hence
removed it. If you agree, I will make other changes in the next patch.
o
> Adding attributes to IndexFieldType
> -----------------------------------
>
> Key: LUCENE-8601
> URL: https://issues.apache.org/jira/browse/LUCENE-8601
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 7.5
> Reporter: Murali Krishna P
> Priority: Major
> Attachments: LUCENE-8601.01.patch, LUCENE-8601.02.patch,
> LUCENE-8601.03.patch, LUCENE-8601.04.patch, LUCENE-8601.05.patch,
> LUCENE-8601.patch
>
>
> Today, we can write a custom Field using custom IndexFieldType, but when the
> DefaultIndexingChain converts [IndexFieldType to
> FieldInfo|https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/index/DefaultIndexingChain.java#L662],
> only few key informations such as indexing options and doc value type are
> retained. The [Codec gets the
> FieldInfo|https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/codecs/DocValuesConsumer.java#L90],
> but not the type details.
>
> FieldInfo has support for ['attributes'|
> https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/index/FieldInfo.java#L47]
> and it would be great if we can add 'attributes' to IndexFieldType also and
> copy it to FieldInfo's 'attribute'.
>
> This would allow someone to write a custom codec (extending docvalueformat
> for example) for only the 'special field' that he wants and delegate the rest
> of the fields to the default codec.
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