Dear Community,
I am currently working on a Solr Custom Plugin, which - for a group query -
adds both total matches and number of groups to the response and also keeps the
response format as if it is not a group query. One additional requirement is
that numFound should contain the number of groups instead of total matches.
This whole thing is required since we have some limitations on the consumer
side and want to keep the same response format.
If I use group.main=true, I get the results in "usual" format, but the
group.ngroups=true does not effect anymore. So, I decided to create a custom
request handler in order to get number of groups and create the response format
which we need for the requester. This format is basically:
---{
//...
"response": {
"numFound": 25, // contains number of grouped results --> for pagination
reasons
"total": 401 // contains number of total results
"start": 0,
"docs": [
{
"id": "26207825"
},
// ...
}
---
My first question would be: is this a good approach with a custom request
handler, or is there a better/easier approach to achieve this.
I went ahead and (tried) to implement the custom request handler. From a group
request (group.format=simple&&group.ngroups=true), I can get a "docList" (or
docSlice) from the "grouped" part, but basically putting this docList to the
response gives me the same result with group.main=true. Therefore I thought, I
would create a new docSlice with mostly the content from the old docSlice and
put this in the response. That works for start=0, but as soon as I start
pagination and set start anything else than zero, I get an error. Because, even
though the start is not zero, the docs[] holds skipped results documents to,
but with document iterator I can only access a subset of it, so my new docSlice
would only contain a subset of documents. Here is the method for creating a new
docSlice:
---private DocSlice getGroupedDocList(SimpleOrderedMap grouped, int numGroups) {
DocSlice docSlice = (DocSlice) grouped.get("doclist");
int offset = docSlice.offset();
int docSize = docSlice.size();
int len = offset + docSize;
boolean hasScore = docSlice.hasScores();
int[] docs = new int[len];
float[] scores = new float[len];
DocIterator iterator = docSlice.iterator();
int i = 0;
while (i < len && iterator.hasNext()) {
docs[i] = iterator.nextDoc();
LOGGER.error("Doc added: " + docs[i]);
if (hasScore) { scores[i] = iterator.score(); }
i++;
}
long matches = numGroups;
float maxScore = docSlice.maxScore();
DocSlice newDocSlice = new DocSlice(offset, len, docs, scores, matches,
maxScore);
return newDocSlice;
}
---
I am kind of stuck at this point. Can someone maybe help me?
Best regards,
Deniz C.
