feat: make gen4 the default planner for release 14

Signed-off-by: Andres Taylor <[email protected]>

go/vt/vtgate/planbuilder/builder.go

@@ -111,9 +111,11 @@ func getConfiguredPlanner(vschema plancontext.VSchema, v3planner func(string) se
 			fallback: v3planner(query),
 		}
 		return fp.plan, nil
-	default:
-		// default is v3 plan
+	case V3:
 		return v3planner(query), nil
+	default:
+		// default is gen4 plan
+		return gen4Planner(query, Gen4), nil
 	}
 }
 

go/vt/vtgate/vtgate.go

@@ -82,7 +82,7 @@ var (
 	// Put set-passthrough under a flag.
 	sysVarSetEnabled = flag.Bool("enable_system_settings", true, "This will enable the system settings to be changed per session at the database connection level")
 	setVarEnabled    = flag.Bool("enable_set_var", true, "This will enable the use of MySQL's SET_VAR query hint for certain system variables instead of using reserved connections")
-	plannerVersion   = flag.String("planner_version", "v3", "Sets the default planner to use when the session has not changed it. Valid values are: V3, Gen4, Gen4Greedy and Gen4Fallback. Gen4Fallback tries the new gen4 planner and falls back to the V3 planner if the gen4 fails. All Gen4 versions should be considered experimental!")
+	plannerVersion   = flag.String("planner_version", "gen4", "Sets the default planner to use when the session has not changed it. Valid values are: V3, Gen4, Gen4Greedy and Gen4Fallback. Gen4Fallback tries the gen4 planner and falls back to the V3 planner if the gen4 fails.")
 
 	// lockHeartbeatTime is used to set the next heartbeat time.
 	lockHeartbeatTime = flag.Duration("lock_heartbeat_time", 5*time.Second, "If there is lock function used. This will keep the lock connection active by using this heartbeat")