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https://issues.apache.org/jira/browse/LUCENE-2308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12844710#action_12844710
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Chris Male commented on LUCENE-2308:
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{quote}
I'm not sure if strict immutability is necessary - there's everything in
between too.
One can simply say that all changes should be made before first use, and after
that point it's undefined.
{quote}
I'm really unsure about this if people are going to be using a FieldType
instance with multiple Fields. Perhaps this really is just an edge case.
{quote}
Unrelated question: I assume that this would retain the same flexibility as we
have today... the ability to change FieldType for field "foo" from one document
to the next?
{quote}
Are you wanting to be able to reuse the same Field instance in both documents
while defining separate FieldTypes? Or is creating new Field instances okay?
> Separately specify a field's type
> ---------------------------------
>
> Key: LUCENE-2308
> URL: https://issues.apache.org/jira/browse/LUCENE-2308
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael McCandless
>
> This came up from dicussions on IRC. I'm summarizing here...
> Today when you make a Field to add to a document you can set things
> index or not, stored or not, analyzed or not, details like omitTfAP,
> omitNorms, index term vectors (separately controlling
> offsets/positions), etc.
> I think we should factor these out into a new class (FieldType?).
> Then you could re-use this FieldType instance across multiple fields.
> The Field instance would still hold the actual value.
> We could then do per-field analyzers by adding a setAnalyzer on the
> FieldType, instead of the separate PerFieldAnalzyerWrapper (likewise
> for per-field codecs (with flex), where we now have
> PerFieldCodecWrapper).
> This would NOT be a schema! It's just refactoring what we already
> specify today. EG it's not serialized into the index.
> This has been discussed before, and I know Michael Busch opened a more
> ambitious (I think?) issue. I think this is a good first baby step. We could
> consider a hierarchy of FIeldType (NumericFieldType, etc.) but maybe hold
> off on that for starters...
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