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database/sql: preallocate list slice in Drivers()

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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>
This commit is contained in:
Julien Schmidt 2019-09-30 00:07:34 +00:00 committed by Brad Fitzpatrick
parent 931365763a
commit 843fec1c7d
1 changed files with 1 additions and 1 deletions
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2
src/database/sql/sql.go
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@ -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)
}