The version of GO should be 1.10 or above.

[zbdba]

What have you changed? (mandatory)

The version of GO should be 1.10 or above,because 1.9 can't support math.Round

What are the type of the changes (mandatory)?

Bug fix

How has this PR been tested (mandatory)?

Use GO 1.9.4 version:

[root@zbdba tidb]# make server
make parser
make[1]: Entering directory /data1/source_code/src/github.com/pingcap/tidb' CGO_ENABLED=0 go build -o bin/goyacc parser/goyacc/main.go bin/goyacc -o /dev/null parser/parser.y Parse table entries: 708693 of 1797400, x 16 bits == 1417386 bytes bin/goyacc -o parser/parser.go parser/parser.y 2>&1 | egrep "(shift|reduce)/reduce" | awk '{print} END {if (NR > 0) {print "Find conflict in parser.y. Please check y.output for more information."; exit 1;}}' rm -f y.output make[1]: Leaving directory /data1/source_code/src/github.com/pingcap/tidb'
CGO_ENABLED=0 go build -ldflags '-X "github.com/pingcap/tidb/mysql.TiDBReleaseVersion=v2.1.0-beta-7-gf6ee36e" -X "github.com/pingcap/tidb/util/printer.TiDBBuildTS=2018-07-03 06:49:15" -X "github.com/pingcap/tidb/util/printer.TiDBGitHash=f6ee36e08c3a11b9c93135f79e4ed984bee9564c" -X "github.com/pingcap/tidb/util/printer.TiDBGitBranch=master" -X "github.com/pingcap/tidb/util/printer.GoVersion=go version go1.9.4 linux/amd64"' -o bin/tidb-server tidb-server/main.go
github.com/pingcap/tidb/statistics
statistics/histogram.go:124:10: undefined: math.Round
make: *** [server] Error 2

use GO 1.10.3 version:

make success

[sre-bot]

Hi contributor, thanks for your PR.

This patch needs to be approved by someone of admins. They should reply with "/ok-to-test" to accept this PR for running test automatically.

[shenli]

LGTM

[shenli]

@zbdba Thanks!

[zimulala]

LGTM