Unstable test TestDefaultColumnWithReplace

[zimulala]

Bug Report

1674 --- FAIL: TestDefaultColumnWithReplace (0.80s)
1675     testkit.go:450:
1676             Error Trace:    /Users/bb7133/Projects/gopath/src/[github.com/pingcap/tidb/pkg/testkit/testkit.go:450](http://github.com/pingcap/tidb/pkg/testkit/testkit.go:450)
1677                                         /Users/bb7133/Projects/gopath/src/[github.com/pingcap/tidb/pkg/ddl/db_inte](http://github.com/pingcap/tidb/pkg/ddl/db_inte)     gration_test.go:1631
1678             Error:          Not equal:
1679                             expected: 1292
1680                             actual  : 1690
1681             Test:           TestDefaultColumnWithReplace
1682             Messages:       sql: insert into t1(c) values (1), Assertion failed, origin err:
1683                               ERROR 1690 (22003): BIGINT value is out of range in '7E7919'
1684 FAIL
1685 run all tasks takes 8m42.325379667

master