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https://issues.apache.org/jira/browse/SOLR-12499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16517703#comment-16517703
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Joel Bernstein commented on SOLR-12499:
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What do you think of calling the operation "flatten"?
Also what should be done with the fields that are not listed to be merged?
Maybe we should merge all fields?
> 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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