[jira] [Created] (SOLR-15213) Add support for "merge" atomic update operation for child documents

["James Ashbourne (Jira)" <ji...@apache.org>]

James Ashbourne created SOLR-15213:
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             Summary: Add support for "merge" atomic update operation for child documents
                 Key: SOLR-15213
                 URL: https://issues.apache.org/jira/browse/SOLR-15213
             Project: Solr
          Issue Type: New Feature
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: James Ashbourne


Solr has "add", "set", "add-distinct" which work but all have their limitations. Namely, there's currently no way to atomically update a document where that document may or may not be present already with merging if it is present.

i.e. in the scenario where we have a document with two nested children: 
  
{noformat}
{"id": "ocean1", 
"_isParent":"true", 
"fish": [ 
    {
     "id": "fish1", 
     "type_s": "fish", 
     "name_s": "Doe", 
     "_isParent":"false"}, 
    {
     "id": "fish2", 
     "type_s": "fish", 
     "name_s": "Hans", 
     "_isParent":"false"}]
}{noformat}
 
 If we later want to update that child doc e.g.:
{noformat}
{"id": "ocean1", 
"_isParent":"true", 
"fish": [ 
    {
     "id": "fish1", 
     "type_s": "fish", 
     "name_s": "James", // new name
     "_isParent":"false"}, 
]
}{noformat}
 
 Existing operations:
 - "add" - will add another nested doc with the same id leaving us with two children with the same id.
 - "set" - replaces the whole list of child docs with the single doc, we could use this but would first have to fetch all the existing children.
 - "add-distinct" - will reject the update based on the doc already being present.

I've got some changes (see patch) that a new option "merge" which checks based on the id and merges the new document with the old with a fall back to add if there is no id match.

 

 



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