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https://issues.apache.org/jira/browse/SOLR-7938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14995421#comment-14995421
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Joel Bernstein commented on SOLR-7938:
--------------------------------------
Just reviewing the implementation for this ticket. Rather then having the
MergeStream take a N streams we could have a MultiMergeStream that under the
covers would loop over the streams and create compounded MergeStreams.
For example merging streams a,b and c could be expressed like this inside of
the MultiMergeStream:
{code}
stream = new MergeStream(new MergeStream(a, c, comp), b, comp);
{code}
There's something kind of nice about this compounding of MergeStreams.
The Expression would like this:
{code}
multiMerge(
search(collection1, q="id:(0 4)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s
asc"),
search(collection1, q="id:(1)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s asc"),
search(collection1, q="id:(2)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s asc"),
on="a_f asc"
)
{code}
> MergeStream to support N streams
> --------------------------------
>
> Key: SOLR-7938
> URL: https://issues.apache.org/jira/browse/SOLR-7938
> Project: Solr
> Issue Type: Improvement
> Components: SolrJ
> Affects Versions: Trunk
> Reporter: Dennis Gove
> Priority: Minor
> Labels: streaming
> Attachments: SOLR-7938.patch
>
>
> Enhances MergeStream to support merging N streams. This was previously
> limited to merging just two streams but with this enhancement it can now
> accept any number of streams to merge.
> Based on the comparator, if more than one stream could provide the next value
> then the selected value will follow the order of the streams as they appear
> in the expression or were added to the MergeStream object.
> {code}
> merge(
> search(collection1, q="id:(0 4)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s
> asc"),
> search(collection1, q="id:(1)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s
> asc"),
> search(collection1, q="id:(2)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s
> asc"),
> on="a_f asc"
> )
> {code}
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