[jira] [Commented] (SOLR-12519) Support Deeply Nested Docs In Child Documents Transformer

["David Smiley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-12519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16537381#comment-16537381 ] 

David Smiley commented on SOLR-12519:
-------------------------------------

bq. my query is for all the children of "a:b", which contain the key "e" in them

That's one use-case, "all children that have a certain key" but there are perhaps more use-cases to be addressed in this issue?
# all child docs matching some custom query   (e.g. your example above of {{e:\*}})
# all child docs of a certain key, e.g. all "c" docs.
# ... and all their descendants Y/N
# all child docs at a certain path
# ... and all their descendants Y/N

In all these cases, we must always retrieve all ancestors up to the root document I think.

Perhaps some path syntax/language could articulate this?

Ultimately we'll want to utilize PathHierarchyTokenizer in some way.


> 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
>
> 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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