GODRIVER-2649 Remove RW Concern Logic from RunCommand (mongodb#1450)

mongo/database.go

@@ -185,18 +185,21 @@ func (db *Database) processRunCommand(ctx context.Context, cmd interface{},
 		op = operation.NewCommand(runCmdDoc)
 	}
 
-	// TODO(GODRIVER-2649): ReadConcern(db.readConcern) will not actually pass the database's
-	// read concern. Remove this note once readConcern is correctly passed to the operation
-	// level.
 	return op.Session(sess).CommandMonitor(db.client.monitor).
 		ServerSelector(readSelect).ClusterClock(db.client.clock).
-		Database(db.name).Deployment(db.client.deployment).ReadConcern(db.readConcern).
+		Database(db.name).Deployment(db.client.deployment).
 		Crypt(db.client.cryptFLE).ReadPreference(ro.ReadPreference).ServerAPI(db.client.serverAPI).
 		Timeout(db.client.timeout).Logger(db.client.logger), sess, nil
 }
 
-// RunCommand executes the given command against the database. This function does not obey the Database's read
-// preference. To specify a read preference, the RunCmdOptions.ReadPreference option must be used.
+// RunCommand executes the given command against the database.
+//
+// This function does not obey the Database's readPreference. To specify a read
+// preference, the RunCmdOptions.ReadPreference option must be used.
+//
+// This function does not obey the Database's readConcern or writeConcern. A
+// user must supply these values manually in the user-provided runCommand
+// parameter.
 //
 // The runCommand parameter must be a document for the command to be executed. It cannot be nil.
 // This must be an order-preserving type such as bson.D. Map types such as bson.M are not valid.

x/mongo/driver/operation/command.go

@@ -14,7 +14,6 @@ import (
 	"go.mongodb.org/mongo-driver/event"
 	"go.mongodb.org/mongo-driver/internal/logger"
 	"go.mongodb.org/mongo-driver/mongo/description"
-	"go.mongodb.org/mongo-driver/mongo/readconcern"
 	"go.mongodb.org/mongo-driver/mongo/readpref"
 	"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
 	"go.mongodb.org/mongo-driver/x/mongo/driver"
@@ -24,7 +23,6 @@ import (
 // Command is used to run a generic operation.
 type Command struct {
 	command        bsoncore.Document
-	readConcern    *readconcern.ReadConcern
 	database       string
 	deployment     driver.Deployment
 	selector       description.ServerSelector
@@ -79,7 +77,6 @@ func (c *Command) Execute(ctx context.Context) error {
 		return errors.New("the Command operation must have a Deployment set before Execute can be called")
 	}
 
-	// TODO(GODRIVER-2649): Actually pass readConcern to underlying driver.Operation.
 	return driver.Operation{
 		CommandFn: func(dst []byte, desc description.SelectedServer) ([]byte, error) {
 			return append(dst, c.command[4:len(c.command)-1]...), nil
@@ -163,16 +160,6 @@ func (c *Command) Deployment(deployment driver.Deployment) *Command {
 	return c
 }
 
-// ReadConcern specifies the read concern for this operation.
-func (c *Command) ReadConcern(readConcern *readconcern.ReadConcern) *Command {
-	if c == nil {
-		c = new(Command)
-	}
-
-	c.readConcern = readConcern
-	return c
-}
-
 // ReadPreference set the read preference used with this operation.
 func (c *Command) ReadPreference(readPreference *readpref.ReadPref) *Command {
 	if c == nil {