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https://issues.apache.org/jira/browse/SOLR-9337?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein resolved SOLR-9337.
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Resolution: Implemented
Fix Version/s: 6.3
> 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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