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https://issues.apache.org/jira/browse/SOLR-12630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16571925#comment-16571925
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David Smiley commented on SOLR-12630:
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The internal {{_ROOT_}} field and other nested doc fields we've been adding are
only populated for nested documents, which is today equivalent to "block"
addition – i.e. atomically all at once. Your proposal implies that somehow
they would need to be populated when they are provided stand-alone somehow.
How would that work?
Your claim "currently the only way to query child documents is using BlockJoin"
is false, I think. Adding docs in "block" fashion allows BlockJoin queries to
work, but BlockJoin queries are not required to do all/any queries. You could
use JoinQParser if you wanted to. The _point_ of adding docs in blocks is to
allow you to use BlockJoin queries which are pretty fast compared to
JoinQParser equivalents.
Perhaps you mean to convey this idea: it'd be nice if the query method could
work consistently using either "block" style doc addition or standalone docs (+
metadata to express relationships). Internally somehow it should detect which
mechanism is most efficient (use BlockJoin if possible). This sounds hard; I'm
not sure if this is even what you mean though.
> Query children without using block join
> ---------------------------------------
>
> Key: SOLR-12630
> URL: https://issues.apache.org/jira/browse/SOLR-12630
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: mosh
> Priority: Major
>
> Currently work is being put into Solr to support nested document hierarchies,
> keeping the original relation between parent and child docs
> ([SOLR-12298|https://issues.apache.org/jira/browse/SOLR-12298],
> [SOLR-12441|https://issues.apache.org/jira/browse/SOLR-12441]). Currently the
> only way to query child documents is using BlockJoin. I was thinking perhaps
> we could introduce a way to query documents that are not indexed in the same
> block with a different transformer, or perhaps add this feature to the
> ChildDocTransformer.
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