[jira] [Commented] (SOLR-12499) Add reduce operation to merge field values

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

    [ https://issues.apache.org/jira/browse/SOLR-12499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16517086#comment-16517086 ] 

Christian Spitzlay commented on SOLR-12499:
-------------------------------------------

I created a draft version of what I had in mind here:

[https://github.com/cspitzlay/lucene-solr/compare/branch_7x...cspitzlay:branch_7x_field_value_merge?expand=1]

 

> Add reduce operation to merge field values
> ------------------------------------------
>
>                 Key: SOLR-12499
>                 URL: https://issues.apache.org/jira/browse/SOLR-12499
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: streaming expressions
>    Affects Versions: 7.3.1
>            Reporter: Christian Spitzlay
>            Priority: Major
>
> It would be nice to have a reduce operation that lets you collect the values of a field from the group of tuples into an array.
> {code:java}
> Something that transforms
> {
>  "k1": "1",
>  "k2": ["a", "b"]
> },
> {
>  "k1": "2",
>  "k2": ["c", "d"]
> },
> {
>  "k1": "2",
>  "k2": ["e", "f"]
> }
> into
> {
>  "k1": "1",
>  "k2": ["a", "b"]
> },
> {
>  "k1": "2",
>  "k2": ["c", "d", "e", "f"]
> }
> {code}
> and
> {code:java}
> {
>  "k1": "1",
>  "k2": "a"
> },
> {
>  "k1": "2",
>  "k2": "b"
> },
> {
>  "k1": "2",
>  "k2": "c"
> }
> into
> {
>  "k1": "1",
>  "k2": ["a"]
> },
> {
>  "k1": "2",
>  "k2": ["b", "c"]
> }
> {code}



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