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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 edited comment on SOLR-12499 at 6/20/18 2:10 AM:
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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?
was (Author: joel.bernstein):
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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