Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.8 linux/amd64

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/sarath/go"
GORACE=""
GOROOT="/home/sarath/goroot"
GOTOOLDIR="/home/sarath/goroot/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build602887406=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"

What did you do?

Used database/sql lib to insert a a value ( 2^64 - 1 ) as uint64 to a mysql column of type decimal(20,0)

What did you expect to see?

Successful insertion

What did you see instead?

Insertion fails with the following error

"uint64 values with high bit set are not supported"

Code that generates the error

In drivers/types.go found the code

if u64 >= 1<<63 {
			return nil, fmt.Errorf("uint64 values with high bit set are not supported")
}

Here is the link for the code snippet

github/golang