BSONObj ResolvedViewDefinition::asExpandedViewAggregation(const AggregationRequest& request) {
BSONObjBuilder aggregationBuilder;
// Perform the aggregation on the resolved namespace.
aggregationBuilder.append("aggregate", collectionNss.coll());
// The new pipeline consists of two parts: first, 'pipeline' in this ResolvedViewDefinition;
// then, the pipeline in 'request'.
BSONArrayBuilder pipelineBuilder(aggregationBuilder.subarrayStart("pipeline"));
for (auto&& item : pipeline) {
pipelineBuilder.append(item);
}
for (auto&& item : request.getPipeline()) {
pipelineBuilder.append(item);
}
pipelineBuilder.doneFast();
// The cursor option is always specified regardless of the presence of batchSize.
if (request.getBatchSize()) {
BSONObjBuilder batchSizeBuilder(aggregationBuilder.subobjStart("cursor"));
batchSizeBuilder.append(AggregationRequest::kBatchSizeName, *request.getBatchSize());
batchSizeBuilder.doneFast();
} else {
aggregationBuilder.append("cursor", BSONObj());
}
if (request.isExplain())
aggregationBuilder.append("explain", true);
return aggregationBuilder.obj();
}
ExpressionContext::ExpressionContext(OperationContext* opCtx,
const AggregationRequest& request,
std::unique_ptr<CollatorInterface> collator,
StringMap<ResolvedNamespace> resolvedNamespaces)
: isExplain(request.isExplain()),
inShard(request.isFromRouter()),
extSortAllowed(request.shouldAllowDiskUse()),
bypassDocumentValidation(request.shouldBypassDocumentValidation()),
ns(request.getNamespaceString()),
opCtx(opCtx),
collation(request.getCollation()),
_collator(std::move(collator)),
_documentComparator(_collator.get()),
_valueComparator(_collator.get()),
_resolvedNamespaces(std::move(resolvedNamespaces)) {}
