Dennis Gove created SOLR-7584:
---------------------------------
Summary: Add Joins to the Streaming API and Streaming Expressions
Key: SOLR-7584
URL: https://issues.apache.org/jira/browse/SOLR-7584
Project: Solr
Issue Type: Improvement
Components: SolrJ
Reporter: Dennis Gove
Priority: Minor
Add InnerJoinStream, LeftOuterJoinStream, and supporting classes to the
Streaming API to allow for joining between sub-streams.
At its basic, it would look something like this
{code}
innerJoin(
search(collection1, q=*:*, fl="fieldA, fieldB, fieldC", ...),
search(collection2, q=*:*, fl="fieldA, fieldD, fieldE", ...),
on="fieldA=fieldA"
)
{code}
or with multi-field on clauses
{code}
innerJoin(
search(collection1, q=*:*, fl="fieldA, fieldB, fieldC", ...),
search(collection2, q=*:*, fl="fieldA, fieldD, fieldE", ...),
on="fieldA=fieldA, fieldB=fieldD"
)
{code}
I'd also like to support the option of doing a hash join instead of the default
merge join but I haven't yet figured out the best way to express that. I'd like
to let the user tell us which sub-stream should be hashed (the least-cost one).
Also, I've been thinking about field aliasing and might want to add a
SelectStream which serves the purpose of allowing us to limit the fields coming
out and rename fields.
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