From 843fec1c7d75cac3f76620e79f1680d8f058c501 Mon Sep 17 00:00:00 2001
From: Julien Schmidt <go@julienschmidt.com>
Date: Mon, 30 Sep 2019 00:07:34 +0000
Subject: [PATCH] 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: 2bf575be65e9a449322540270988eaf87cec4245
GitHub-Pull-Request: golang/go#34602
Reviewed-on: https://go-review.googlesource.com/c/go/+/197917
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
---
 src/database/sql/sql.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/database/sql/sql.go b/src/database/sql/sql.go
index 93001635be..0f5bbc01c9 100644
--- a/src/database/sql/sql.go
+++ b/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)
 	}