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https://issues.apache.org/jira/browse/SOLR-11600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aroop updated SOLR-11600:
-------------------------
Comment: was deleted
(was: ok Amrit. But I think we really should take a look at providing a
strongly typed option to make a Select stream with custom evaluators.
It is pretty odd that we can create a complex RollupStream in a strongly typed
way, but the moment we want to wrap it within a SelectStream, with some
standard yet custom Evaluators, one needs to go back to constructing a string
.. I was able to go make it as nice as possible, but this is sub-optimal in my
opinion :)
Once I have some time and I get compliance clearance from my organization, I
will consider contributing to this if possible.
But if possible lets do a thought experiment on this, may be we can discuss
this offline and propose a solution. I am still not sure why its not easy to
do. Maybe something is getting lost in translation.)
> Add Constructor to SelectStream which takes StreamEvaluators as argument.
> Current schema forces one to enter a stream expression string only
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-11600
> URL: https://issues.apache.org/jira/browse/SOLR-11600
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrJ, streaming expressions
> Affects Versions: 6.6.1, 7.1
> Reporter: Aroop
> Priority: Trivial
> Labels: easyfix
> Attachments: SOLR-11600.patch
>
>
> The use case is to be able able to supply stream evaluators over a rollup
> stream in the following manner, but with instead with Strongly typed objects
> and not steaming-expression strings.
> {code:bash}
> curl --data-urlencode 'expr=select(
> id,
> div(sum(cat1_i),sum(cat2_i)) as metric1,
> coalesce(div(sum(cat1_i),if(eq(sum(cat2_i),0),null,sum(cat2_i))),0) as
> metric2,
> rollup(
> search(col1, q=*:*, fl="id,cat1_i,cat2_i,cat_s", qt="/export", sort="cat_s
> asc"),
> over="cat_s",sum(cat1_i),sum(cat2_i)
> ))' http://localhost:8983/solr/col1/stream
> {code}
> the current code base does not allow one to provide selectedEvaluators in a
> constructor, so one cannot prepare their select stream via java code:
> {code:java}
> public class SelectStream extends TupleStream implements Expressible {
> private static final long serialVersionUID = 1L;
> private TupleStream stream;
> private StreamContext streamContext;
> private Map<String, String> selectedFields;
> private Map<StreamEvaluator, String> selectedEvaluators;
> private List<StreamOperation> operations;
> public SelectStream(TupleStream stream, List<String> selectedFields)
> throws IOException {
> this.stream = stream;
> this.selectedFields = new HashMap();
> Iterator var3 = selectedFields.iterator();
> while(var3.hasNext()) {
> String selectedField = (String)var3.next();
> this.selectedFields.put(selectedField, selectedField);
> }
> this.operations = new ArrayList();
> this.selectedEvaluators = new HashMap();
> }
> public SelectStream(TupleStream stream, Map<String, String>
> selectedFields) throws IOException {
> this.stream = stream;
> this.selectedFields = selectedFields;
> this.operations = new ArrayList();
> this.selectedEvaluators = new HashMap();
> }
> {code}
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