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https://issues.apache.org/jira/browse/SOLR-10321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085958#comment-16085958
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David Smiley commented on SOLR-10321:
-------------------------------------
I think omitting blank highlights for wildcard specified fields is probably the
way to go, and would be minor enough as to not warrant a request flag/param
(configuration-itis). One aspect of doing this is creating a HashSet of hl.fl
values (up front) and then after highlighting, testing if the field to
highlight is in the set or not. If it isn't, then there's a wildcard
somewhere. Patches welcome :-)
Note that doing wildcard highlights on tons of fields, assuming
hl.requiredFieldMatch=false, assuming analysis offset source, is probably
relatively slow in and of itself, aside from the excessive noise of putting
useless empty entries in the Solr response. The underlying UnifiedHighlighter
will loop over each field to produce a separate FieldHighlighter which
separately analyzes the query to pull out pertinent terms and do other
initialization. For a setup like this, it's all redundant duplicated work per
field. This could probably be addressed at the UnifiedSolrHighlighter level
but it'd be awkward, and may actually ideally need some support at the Lucene
layer too. It would probably have limitations such that a wildcard highlighted
field would then not support per-field config options.
> Unified highlighter returns empty fields when using glob
> --------------------------------------------------------
>
> Key: SOLR-10321
> URL: https://issues.apache.org/jira/browse/SOLR-10321
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: highlighter
> Affects Versions: 6.4.2
> Reporter: Markus Jelsma
> Priority: Minor
> Fix For: 7.0
>
>
> {code}
> q=lama&hl.method=unified&hl.fl=content_*
> {code}
> returns:
> {code}
> <lst
> name="http://www.nu.nl/weekend/3771311/dalai-lama-inspireert-westen.html";>
> <arr name="content_en"/>
> <arr name="content_nl">
> <str>Nobelprijs Voorafgaand aan zijn bezoek aan Nederland is de dalai
> <em>lama</em> in Noorwegen om te vieren dat 25 jaar geleden de
> Nobelprijs voor de Vrede aan hem werd toegekend. Anders dan in Nederland
> wordt de dalai <em>lama</em> niet ontvangen in het Noorse
> parlement. </str>
> </arr>
> <arr name="content_general"/>
> <arr name="content_de"/>
> <arr name="content_fr"/>
> <arr name="content_es"/>
> <arr name="content_pt"/>
> <arr name="content_ja"/>
> <arr name="content_zh-cn"/>
> <arr name="content_th"/>
> <arr name="content_ar"/>
> </lst>
> {code}
> FastVector and original do not emit:
> {code}
> <arr name="content_de"/>
> <arr name="content_fr"/>
> <arr name="content_es"/>
> <arr name="content_pt"/>
> <arr name="content_ja"/>
> <arr name="content_zh-cn"/>
> <arr name="content_th"/>
> <arr name="content_ar"/>
> {code}
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