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https://issues.apache.org/jira/browse/SOLR-8110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15959067#comment-15959067
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Shawn Heisey commented on SOLR-8110:
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[[email protected]],
Don't put dollars signs (or any other character that tends to have special
meaning) in field names. The reason that we plan to enforce a limited
character set (which would definitely exclude the dollar sign) is that we
cannot guarantee that all future functionality will continue to support those
characters in field names, even if *current* functionality does.
General consensus is that the period should be allowed in field names, so your
dynamic fields will likely be acceptable.
> 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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