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From "Chris Male (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2308) Separately specify a field's type
Date Fri, 12 Mar 2010 21:43:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12844702#action_12844702
] 

Chris Male commented on LUCENE-2308:
------------------------------------

{quote}
It would be nice if we could do something similar to IndexWriterConfig
(LUCENE-2294), where you use incremental ctor/setters to set up the
configuration but then once it's used ("bound" to a Field), it's
immutable.
{quote}

Yeah we could use something like a FieldTypeBuilder which could provide a fluid interface
for specifying each property, which then get built into an immutable FieldType at the end.

> 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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