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https://issues.apache.org/jira/browse/SOLR-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14216072#comment-14216072
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Tom Winch commented on SOLR-1387:
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As the name suggests, CharacterUtils works on a char[] whereas we have a
BytesRef (essentially a byte[]). But I think CharacterUtils.toLowerCase() is
doing essentially the same as I'm doing in StringHelper.contains() in that it
converts using Unicode case mapping information (via
Character.toLowerCase(int)).
Yes, sadly making ignoreCase more general would spoil the efficiency of
facet.prefix so I thought safest to leave as a sub-parameter of facet.contains,
which spoils that efficiency already.
> Add more search options for filtering field facets.
> ---------------------------------------------------
>
> Key: SOLR-1387
> URL: https://issues.apache.org/jira/browse/SOLR-1387
> Project: Solr
> Issue Type: New Feature
> Components: search
> Reporter: Anil Khadka
> Assignee: Alan Woodward
> Fix For: 4.9, Trunk
>
> Attachments: SOLR-1387.patch
>
>
> Currently for filtering the facets, we have to use prefix (which use
> String.startsWith() in java).
> We can add some parameters like
> * facet.iPrefix : this would act like case-insensitive search. (or --->
> facet.prefix=a&facet.caseinsense=on)
> * facet.regex : this is pure regular expression search (which obviously would
> be expensive if issued).
> Moreover, allowing multiple filtering for same field would be great like
> facet.prefix=a OR facet.prefix=A ... sth like this.
> All above concepts could be equally applicable to TermsComponent.
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