1 files changed, 71 insertions, 0 deletions
diff --git a/src/mongo/db/pipeline/pipeline_d.h b/src/mongo/db/pipeline/pipeline_d.h
index 467aa9a8d1c..1551a9d035f 100644
--- a/src/mongo/db/pipeline/pipeline_d.h
+++ b/src/mongo/db/pipeline/pipeline_d.h
@@ -32,8 +32,10 @@
 #include <memory>
 
 #include "mongo/bson/bsonobj.h"
+#include "mongo/db/dbdirectclient.h"
 #include "mongo/db/namespace_string.h"
 #include "mongo/db/pipeline/aggregation_request.h"
+#include "mongo/db/pipeline/mongo_process_interface.h"
 #include "mongo/db/query/plan_executor.h"
 
 namespace mongo {
@@ -59,6 +61,75 @@ struct DepsTracker;
  */
 class PipelineD {
 public:
+    class MongoDProcessInterface final : public MongoProcessInterface {
+    public:
+        MongoDProcessInterface(OperationContext* opCtx);
+
+        void setOperationContext(OperationContext* opCtx) final;
+        DBClientBase* directClient() final;
+        bool isSharded(OperationContext* opCtx, const NamespaceString& nss) final;
+        BSONObj insert(const boost::intrusive_ptr<ExpressionContext>& expCtx,
+                       const NamespaceString& ns,
+                       const std::vector<BSONObj>& objs) final;
+        CollectionIndexUsageMap getIndexStats(OperationContext* opCtx,
+                                              const NamespaceString& ns) final;
+        void appendLatencyStats(OperationContext* opCtx,
+                                const NamespaceString& nss,
+                                bool includeHistograms,
+                                BSONObjBuilder* builder) const final;
+        Status appendStorageStats(OperationContext* opCtx,
+                                  const NamespaceString& nss,
+                                  const BSONObj& param,
+                                  BSONObjBuilder* builder) const final;
+        Status appendRecordCount(OperationContext* opCtx,
+                                 const NamespaceString& nss,
+                                 BSONObjBuilder* builder) const final;
+        BSONObj getCollectionOptions(const NamespaceString& nss) final;
+        Status renameIfOptionsAndIndexesHaveNotChanged(
+            OperationContext* opCtx,
+            const BSONObj& renameCommandObj,
+            const NamespaceString& targetNs,
+            const BSONObj& originalCollectionOptions,
+            const std::list<BSONObj>& originalIndexes) final;
+        StatusWith<std::unique_ptr<Pipeline, PipelineDeleter>> makePipeline(
+            const std::vector<BSONObj>& rawPipeline,
+            const boost::intrusive_ptr<ExpressionContext>& expCtx,
+            const MakePipelineOptions opts = MakePipelineOptions{}) final;
+        Status attachCursorSourceToPipeline(const boost::intrusive_ptr<ExpressionContext>& expCtx,
+                                            Pipeline* pipeline) final;
+        std::vector<BSONObj> getCurrentOps(OperationContext* opCtx,
+                                           CurrentOpConnectionsMode connMode,
+                                           CurrentOpUserMode userMode,
+                                           CurrentOpTruncateMode truncateMode) const final;
+        std::string getShardName(OperationContext* opCtx) const final;
+        std::vector<FieldPath> collectDocumentKeyFields(OperationContext* opCtx,
+                                                        const NamespaceString& nss,
+                                                        UUID uuid) const final;
+        boost::optional<Document> lookupSingleDocument(
+            const boost::intrusive_ptr<ExpressionContext>& expCtx,
+            const NamespaceString& nss,
+            UUID collectionUUID,
+            const Document& documentKey,
+            boost::optional<BSONObj> readConcern) final;
+        std::vector<GenericCursor> getCursors(
+            const boost::intrusive_ptr<ExpressionContext>& expCtx) const final;
+
+    private:
+        /**
+         * Looks up the collection default collator for the collection given by 'collectionUUID'. A
+         * collection's default collation is not allowed to change, so we cache the result to allow
+         * for quick lookups in the future. Looks up the collection by UUID, and returns 'nullptr'
+         * if the collection does not exist or if the collection's default collation is the simple
+         * collation.
+         */
+        std::unique_ptr<CollatorInterface> _getCollectionDefaultCollator(OperationContext* opCtx,
+                                                                         const NamespaceString& nss,
+                                                                         UUID collectionUUID);
+
+        DBDirectClient _client;
+        std::map<UUID, std::unique_ptr<const CollatorInterface>> _collatorCache;
+    };
+
     /**
      * If the first stage in the pipeline does not generate its own output documents, attaches a
      * DocumentSourceCursor to the front of the pipeline which will output documents from the