SOLR-16287 : MapStream - remap tuple value(s)

[danrosher]

https://issues.apache.org/jira/browse/SOLR-16287

Description

Enables atomic updates for update stream by remapping a value to tuple, solr will recognise the map as an atomic update, otherwise update stream simply overwrites. Normal Solr requirements for atomic/in-place updates are still necessary.

Solution

Remap from (k,v) => k -> newKey -> value

e.g. with

map(,"cand_id=add-distinct") , convert stream tuples from

From:
{"cand_id":5718,id:123,v_i:345}
To:
{ id:123, v_i:345, "cand_id": { "add-distinct": 5718 },

Tests

e.g.
With:
new UpdateRequest() .add(id, "1", "a_ss", "foo", "b_i", "1", "c_d", "3.3", "d_b", "true")
Then:
update(collection1,map(tuple(id="1",a_ss="bar"),"a_ss=add-distinct")) will add-distinct 'bar' to a_ss to then contain ['foo','bar']

Checklist

Please review the following and check all that apply:

• I have reviewed the guidelines for How to Contribute and my code conforms to the standards described there to the best of my ability.
• I have created a Jira issue and added the issue ID to my pull request title.
• I have given Solr maintainers access to contribute to my PR branch. (optional but recommended)
• I have developed this patch against the main branch.
• I have run ./gradlew check.
• I have added tests for my changes.
• I have added documentation for the Reference Guide

[epugh]

Docs are looking nice!

[epugh]

I sent a note to dev mailing list to see if @joel-bernstein can review it ;-) If he can't, I can try, but it's just an area I haven't worked much in!

[epugh]

Let's give it another few days, and then, if I don't review/merge it, can you bug me? Say Thursday??? Thanks for this @danrosher

[danrosher]

Will do @epugh . I'll be away for a week after that.

[risdenk]

@epugh ping ;) slightly more than a week or so. anything left to do here?

[epugh]

FYI, Joel is going to merge this once the new jar for streaming is completed.

[github-actions]

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