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https://issues.apache.org/jira/browse/SOLR-17975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18031912#comment-18031912
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Chris M. Hostetter commented on SOLR-17975:
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{quote}BUT! ... the most complex part of figuring out ow to support
LateInteractionField in Solr is going to come down to what the field values
should look like when adding/updating docs containing this field – and what the
query input should look like – given that the field values are
"multi-dimensional array of floats"
{quote}
SOLR-17974 addresses the bigger picture problem of trying to use "lists of xxx"
as a value in a multi-valued field in SolrInputDocument & SolrDocument – but
we're also going to need to address questions of the "query time"
representation (which is a {{float[][]}} at the lucene level.
Since the query time logic will likely (almost certainly?) need a pure string
format for the {{float[][]}} input that it can parse -- one option is to kick
the SOLR-17974 can down the road even farther, and let the rest of Solr/SolrJ
deal with the field values of some new
{{lo.a.s.schema.LateInteractionFieldType}} as "specially formatted Strings",
that only the internal code of the new FieldType worries about parsing into
{{float[][]}}.
> Add support for Lucene's LateInteractionField
> ---------------------------------------------
>
> Key: SOLR-17975
> URL: https://issues.apache.org/jira/browse/SOLR-17975
> Project: Solr
> Issue Type: New Feature
> Reporter: Chris M. Hostetter
> Priority: Major
>
> Lucene 10.3 added a
> [LateInteractionField.|https://lucene.apache.org/core/10_3_1/core/org/apache/lucene/document/LateInteractionField.html].
> Basic support for this in Solr would be a new {{FieldType}} and some
> associated {{QParser}} support to be able to use tose fields in conjunction
> iwth Lucene's {{TestRescoreTopNQuery}} and/or {{LateInteractionRescorer}}
> (and/or {{LateInteractionFloatValuesSource}} + {{DoubleValuesSourceRescorer}}
> -- see SOLR-17951)
> BUT! ... the most complex part of figuring out ow to support
> {{LateInteractionField}} in Solr is going to come down to what the field
> values should look like when adding/updating docs containing this field --
> and what the query input should look like -- given that the field values are
> "multi-dimensional array of floats"
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