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https://issues.apache.org/jira/browse/LUCENE-1058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12546004
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Yonik Seeley commented on LUCENE-1058:
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{quote}To some extent, I was thinking that this could help optimize Solr's
copyField mechanism.{quote}
Maybe... it would take quite a bit of work to automate it though I think.
As far as pre-analysis costs. iteration is pretty much free in comparison to
everything else. Memory is the big factor.
Things like entity extraction are normally not done by lucene analyzers
AFAIK... but if one wanted a framework to do that, the problem is more generic.
Your really want to be able to add to multiple fields from multiple other
fields.
> New Analyzer for buffering tokens
> ---------------------------------
>
> Key: LUCENE-1058
> URL: https://issues.apache.org/jira/browse/LUCENE-1058
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Grant Ingersoll
> Assignee: Grant Ingersoll
> Priority: Minor
> Fix For: 2.3
>
> Attachments: LUCENE-1058.patch, LUCENE-1058.patch, LUCENE-1058.patch,
> LUCENE-1058.patch, LUCENE-1058.patch
>
>
> In some cases, it would be handy to have Analyzer/Tokenizer/TokenFilters that
> could siphon off certain tokens and store them in a buffer to be used later
> in the processing pipeline.
> For example, if you want to have two fields, one lowercased and one not, but
> all the other analysis is the same, then you could save off the tokens to be
> output for a different field.
> Patch to follow, but I am still not sure about a couple of things, mostly how
> it plays with the new reuse API.
> See
> http://www.gossamer-threads.com/lists/lucene/java-dev/54397?search_string=BufferingAnalyzer;#54397
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