How to use

org.apache.jena.sparql.engine.QueryExecutionBase

constructor

protected static QueryExecution make(Query query, Dataset dataset, DatasetGraph dsg, Context context) {
  if ( dsg == null && dataset != null )
    dsg = dataset.asDatasetGraph();
  query.setResultVars() ;
  if ( context == null )
    context = ARQ.getContext() ;  // .copy done in QueryExecutionBase -> Context.setupContext.
  QueryEngineFactory f = findFactory(query, dsg, context) ;
  if ( f == null ) {
    Log.warn(QueryExecutionFactory.class, "Failed to find a QueryEngineFactory") ;
    return null ;
  }
  return new QueryExecutionBase(query, dataset, dsg, context, f) ;
}

@Override
public QueryExecution createQueryExecution(Query query) {
  // Copied from internals of jena's QueryExecutionFactory.create(query, dataset);
  query.setResultVars() ;
  if ( context == null )
    context = ARQ.getContext();  // .copy done in QueryExecutionBase -> Context.setupContext.
  DatasetGraph dsg = null ;
  if ( dataset != null )
    dsg = dataset.asDatasetGraph() ;
  QueryEngineFactory f = QueryEngineRegistry.get().find(query, dsg, context);
  if ( f == null )
  {
    Log.warn(QueryExecutionFactory.class, "Failed to find a QueryEngineFactory for query: "+query) ;
    return null ;
  }
  //dataset.begin(ReadWrite.WRITE);
  return new QueryExecutionBase(query, dataset, context, f) ;
}

try(QueryExecution qExec1 = new QueryExecutionBase(query, ds, null, f)) {
  rs1 = ResultSetFactory.makeRewindable(qExec1.execSelect()) ;

try(QueryExecution qExec1 = new QueryExecutionBase(query, ds, null, f)) {
  rs1 = ResultSetFactory.makeRewindable(qExec1.execSelect()) ;

try(QueryExecution qExec1 = new QueryExecutionBase(query, ds, null, f)) {
  rs1$ = ResultSetFactory.makeRewindable(qExec1.execSelect()) ;

try(QueryExecution qExec1 = new QueryExecutionBase(query, ds, null, f)) {
  rs1$ = ResultSetFactory.makeRewindable(qExec1.execSelect()) ;