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https://issues.apache.org/jira/browse/SOLR-3251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571548#comment-13571548
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Steve Rowe commented on SOLR-3251:
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I'm interested in working on this issue. I'm new to the ways of Solr dev,
though, so I'd appreciate assistance in getting things done right.
{quote}
Thinking a little further about this, building a new schema when it changes
(i.e. making schema effectively immutable), might be a good idea too.
For performance reasons, we'd want to share/reuse objects across the different
schema instances of course.
{quote}
The DOM for the previous schema could be kept around and compared to the DOM
for the new schema, and each object could keep a reference to the DOM node from
which it came. When corresponding DOM nodes compare as equal, then reloading
that object isn't necessary.
Keeping the DOM around would also allow for round-tripping comments and
whitespace, since those can be stored in the DOM. To make the new schema's DOM
on the node handling the add field request, copy the old DOM, then insert a
node for the new field. On second thought, I think it makes sense for the DOM
to be mutable, and not require a full copy on minting a new schema, since
otherwise unchanged objects would need to be modified to point to their new DOM
node, and objects in the old schema will no longer refer to the old DOM.
> dynamically add field to schema
> -------------------------------
>
> Key: SOLR-3251
> URL: https://issues.apache.org/jira/browse/SOLR-3251
> Project: Solr
> Issue Type: New Feature
> Reporter: Yonik Seeley
> Attachments: SOLR-3251.patch
>
>
> One related piece of functionality needed for SOLR-3250 is the ability to
> dynamically add a field to the schema.
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