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https://issues.apache.org/jira/browse/SOLR-12519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596383#comment-16596383
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David Smiley commented on SOLR-12519:
-------------------------------------
This morning I spent some time carefully indenting the document string literal
in TestChildDocTransformerHierarchy#generateDocHierarchy and a couple of it's
nearby methods so that I could more clearly see what was going on. I also
enhanced testParentFilterLimitJSON to test that it does *not* return the
"toppings", because they follow the "lonely" stuff which is returned. (a quick
try of increasing the limit caused the assertion to fail so I think it's
right). I also simplified the limit/match logic, and used ">=" which I think
is more clearly correct than "==" since we collect more matches due to needing
ancestors.
Please close the PR.
> Support Deeply Nested Docs In Child Documents Transformer
> ---------------------------------------------------------
>
> Key: SOLR-12519
> URL: https://issues.apache.org/jira/browse/SOLR-12519
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: mosh
> Priority: Major
> Attachments: SOLR-12519-fix-solrj-tests.patch,
> SOLR-12519-no-commit.patch, SOLR-12519.patch
>
> Time Spent: 25h 10m
> Remaining Estimate: 0h
>
> As discussed in SOLR-12298, to make use of the meta-data fields in
> SOLR-12441, there needs to be a smarter child document transformer, which
> provides the ability to rebuild the original nested documents' structure.
> In addition, I also propose the transformer will also have the ability to
> bring only some of the original hierarchy, to prevent unnecessary block join
> queries. e.g.
> {code} {"a": "b", "c": [ {"e": "f"}, {"e": "g"} , {"h": "i"} ]} {code}
> Incase my query is for all the children of "a:b", which contain the key "e"
> in them, the query will be broken in to two parts:
> 1. The parent query "a:b"
> 2. The child query "e:*".
> If the only children flag is on, the transformer will return the following
> documents:
> {code}[ {"e": "f"}, {"e": "g"} ]{code}
> In case the flag was not turned on(perhaps the default state), the whole
> document hierarchy will be returned, containing only the matching children:
> {code}{"a": "b", "c": [ {"e": "f"}, {"e": "g"} ]{code}
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