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https://issues.apache.org/jira/browse/SOLR-9337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953637#comment-15953637
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David Smiley commented on SOLR-9337:
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bq. How does a fetch differ from an innerJoin?
IMO I think that points to an unfortunate choice of names for this streaming
expression. I had the same question. "join" should have been in this
streaming expression's name; be it "join" exactly or some variation but I think
developers expect to see that term if it works like DB joins that we all know.
> Add fetch Streaming Expression
> ------------------------------
>
> Key: SOLR-9337
> URL: https://issues.apache.org/jira/browse/SOLR-9337
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Joel Bernstein
> Fix For: 6.3
>
> Attachments: SOLR-9337.patch, SOLR-9337.patch
>
>
> The fetch() Streaming Expression wraps another expression and fetches
> additional fields for documents in batches. The fetch() expression will
> stream out the Tuples after the data has been fetched. Fields can be fetched
> from any SolrCloud collection.
> Sample syntax:
> {code}
> daemon(
> update(collectionC, batchSize="100"
> fetch(collectionB,
> topic(checkpoints, collectionA, q="*:*", fl="a,b,c",
> rows="50"),
> fl="j,m,z",
> on="a=j")))
>
> {code}
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