Use copy from

go.mod

@@ -5,7 +5,6 @@ go 1.20
 require (
 	cloud.google.com/go/cloudsqlconn v1.3.0
 	github.com/jackc/pgx/v5 v5.4.3
-	github.com/lib/pq v1.10.9
 	github.com/stretchr/testify v1.8.1
 	google.golang.org/grpc v1.59.0
 )

go.sum

@@ -90,8 +90,6 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
-github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/microsoft/go-mssqldb v1.1.0 h1:jsV+tpvcPTbNNKW0o3kiCD69kOHICsfjZ2VcVu2lKYc=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=

postgres-driver/postgresdriver.go

@@ -7,8 +7,6 @@ import (
 	"net"
 	"time"
 
-	// PQ import is required
-
 	"cloud.google.com/go/cloudsqlconn"
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgtype"
@@ -164,10 +162,10 @@ func createAndConfigurePool(config *pgxpool.Config) (*pgxpool.Pool, error) {
 func getCustomDataTypes(ctx context.Context, pool *pgxpool.Pool) ([]*pgtype.Type, error) {
 	// Get a single connection just to load type information.
 	conn, err := pool.Acquire(ctx)
-	defer conn.Release()
 	if err != nil {
 		return nil, err
 	}
+	defer conn.Release()
 
 	dataTypeNames := []string{
 		"error_sources_enum",