Aroop created SOLR-11600:
----------------------------
Summary: 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: 7.1, 6.6.1
Reporter: Aroop
Fix For: 7.0, 6.6.1
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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