database/sql: preallocate list slice in Drivers()

The required slice capacity is already known. Thus, preallocate a slice with the correct capacity before appending to it.

Change-Id: I45ac2c5f1701caeb3dda20451d371713ae7e7365
GitHub-Last-Rev: 2bf575b
GitHub-Pull-Request: #34602
Reviewed-on: https://go-review.googlesource.com/c/go/+/197917
Reviewed-by: Brad Fitzpatrick <[email protected]>
Run-TryBot: Brad Fitzpatrick <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

Author: julienschmidt

src/database/sql/sql.go

@@ -64,7 +64,7 @@ func unregisterAllDrivers() {
 func Drivers() []string {
 	driversMu.RLock()
 	defer driversMu.RUnlock()
-	var list []string
+	list := make([]string, 0, len(drivers))
 	for name := range drivers {
 		list = append(list, name)
 	}