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

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

mosh created SOLR-12519:
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             Summary: 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


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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