Subclassing QueryComponent for fetching results from a database
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Key: SOLR-1795
URL: https://issues.apache.org/jira/browse/SOLR-1795
Project: Solr
Issue Type: Improvement
Components: SearchComponents - other
Affects Versions: 1.4
Reporter: Dallan Quass
This is a request to change the access on a few fields from package to public.
I've subclassed QueryComponent to allow me to fetch results from a database
(based upon the stored uniqueKey field) instead of from the shards. The only
stored field in solr is the uniqueKey field, and whatever fields I might need
for sorting. To do this I've overridden QueryComponent.finishStage so that
after executing the query, SolrDocuments are created with the uniqueKey field.
A later component populates the rest of the fields in the documents by reading
them from a database.
{code}
public void finishStage(ResponseBuilder rb) {
if (rb.stage == ResponseBuilder.STAGE_EXECUTE_QUERY) {
// Create SolrDocument's from the ShardDoc's
boolean returnScores = (rb.getFieldFlags() &
SolrIndexSearcher.GET_SCORES) != 0;
for (ShardDoc sdoc : rb.resultIds.values()) {
SolrDocument doc = new SolrDocument();
doc.setField(UNIQUE_KEY_FIELDNAME, sdoc.id);
if (returnScores && sdoc.score != null) {
doc.setField("score", sdoc.score);
}
rb._responseDocs.set(sdoc.positionInResponse, doc);
}
}
}
{code}
Everything works fine, but ResponseBuilder variables: *resultIds* and
*_responseDocs*, and ShardDoc variables: *id*, *score*, and
*positionInResponse* currently all have package visibility. I needed to modify
the core solr files to change their visibility to public so that I could access
them in the function above. Is there any chance that they could be changed to
public in a future version of Solr, or somehow make them accessible outside the
package?
If people are interested, I could post the QueryComponent subclass and database
component that I wrote. But it gets a bit involved because the QueryComponent
subclass also handles parsing the query just at the main solr server, and
sending serialized parsed queries to the shards. (Query parsing in my
environment is pretty cpu- and memory-intensive so I do it just at the main
server instead of the shards.)
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