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https://issues.apache.org/jira/browse/SOLR-8110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15170689#comment-15170689
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Shawn Heisey commented on SOLR-8110:
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bq. I doubt there's a ton of people using dollar-signs in their field names
Somebody came into the IRC channel once, using a Solr plugin for some PHP
software which I can no longer remember, and when they shared the schema that
came with the plugin, almost every field had at least two dollar signs in the
name. I've seen all kinds of weird characters in field names. Sometimes they
work, sometimes they don't.
> Start enforcing field naming recomendations in next X.0 release?
> ----------------------------------------------------------------
>
> Key: SOLR-8110
> URL: https://issues.apache.org/jira/browse/SOLR-8110
> Project: Solr
> Issue Type: Improvement
> Reporter: Hoss Man
> Attachments: SOLR-8110.patch, SOLR-8110.patch
>
>
> For a very long time now, Solr has made the following "recommendation"
> regarding field naming conventions...
> bq. field names should consist of alphanumeric or underscore characters only
> and not start with a digit. This is not currently strictly enforced, but
> other field names will not have first class support from all components and
> back compatibility is not guaranteed. ...
> I'm opening this issue to track discussion about if/how we should start
> enforcing this as a rule instead (instead of just a "recommendation") in our
> next/future X.0 (ie: major) release.
> The goals of doing so being:
> * simplify some existing code/apis that currently use hueristics to deal with
> lists of field and produce strange errors when the huerstic fails (example:
> ReturnFields.add)
> * reduce confusion/pain for new users who might start out unaware of the
> recommended conventions and then only later encountering a situation where
> their field names are not supported by some feature and get frustrated
> because they have to change their schema, reindex, update index/query client
> expectations, etc...
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