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https://issues.apache.org/jira/browse/SOLR-11741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17399533#comment-17399533
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David Smiley commented on SOLR-11741:
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Cassandra: [I sort of asked
this|https://issues.apache.org/jira/browse/SOLR-15277?focusedCommentId=17314616&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17314616]
and Tim thought maybe. WDYT [~tpot] ? I just played with the Schema Designer
on main to get myself a bit more familiar. I uploaded a CSV file. It did seem
to guess it but I didn't look thoroughly. Tim's comments on that issue said it
didn't guess so maybe I'm wrong?
If Schema Designer does guess based on the data then I think there is much less
value in the issue being discussed here, but it still has some. If it were to
be committed, I could imagine the Schema Designer being adapted to use it. But
I wouldn't want two competing systems to maintain.
Whatever happens; it's a shame to see some promising work by a contributor get
forgotten after a few years. [~abhidemon] feel free to explicitly ask if you
needed more attention/feedback.
> Offline training mode for schema guessing
> -----------------------------------------
>
> Key: SOLR-11741
> URL: https://issues.apache.org/jira/browse/SOLR-11741
> Project: Solr
> Issue Type: Improvement
> Reporter: Ishan Chattopadhyaya
> Assignee: Ishan Chattopadhyaya
> Priority: Major
> Attachments: RuleForMostAccomodatingField.png, SOLR-11741-temp.patch,
> SOLR-11741.patch, SOLR-11741.patch, SOLR-11741.patch, screenshot-1.png,
> screenshot-3.png
>
>
> Our data driven schema guessing doesn't work under many situations. For
> example, if the first document has a field with value "0", it is guessed as
> Long and subsequent fields with "0.0" are rejected. Similarly, if the same
> field had alphanumeric contents for a latter document, those documents are
> rejected. Also, single vs. multi valued field guessing is not ideal.
> Proposing an offline training mode where Solr accepts bunch of documents and
> returns a guessed schema (without indexing). This schema can then be used for
> actual indexing. I think the original idea is from Hoss.
> I think initial implementation can be based on an UpdateRequestProcessor. We
> can hash out the API soon, as we go along.
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