syncer: fix wrong conversion for mysql BIT (#876)

syncer/dml.go

@@ -363,7 +363,7 @@ func castUnsigned(data interface{}, unsigned bool, tp string) interface{} {
 		}
 		return uint32(v)
 	case int64:
-		return strconv.FormatUint(uint64(v), 10)
+		return uint64(v)
 	}
 
 	return data

syncer/dml_test.go

@@ -15,7 +15,6 @@ package syncer
 
 import (
 	"math"
-	"strconv"
 
 	. "github.com/pingcap/check"
 )
@@ -36,8 +35,8 @@ func (s *testSyncerSuite) TestCastUnsigned(c *C) {
 		{int32(-math.Exp2(23)), true, "mediumint(8) unsigned", uint32(math.Exp2(23))},
 		{int32(-math.Exp2(31)), false, "int(11)", int32(-math.Exp2(31))}, // INT
 		{int32(-math.Exp2(31)), true, "int(10) unsigned", uint32(math.Exp2(31))},
-		{int64(-math.Exp2(63)), false, "bigint(20)", int64(-math.Exp2(63))},                                 // BIGINT
-		{int64(-math.Exp2(63)), true, "bigint(20) unsigned", strconv.FormatUint(uint64(math.Exp2(63)), 10)}, // special case use string to represent uint64
+		{int64(-math.Exp2(63)), false, "bigint(20)", int64(-math.Exp2(63))}, // BIGINT
+		{int64(-math.Exp2(63)), true, "bigint(20) unsigned", uint64(math.Exp2(63))},
 	}
 	for _, cs := range cases {
 		obtained := castUnsigned(cs.data, cs.unsigned, cs.Type)

tests/all_mode/data/db1.increment.sql

@@ -29,4 +29,16 @@ alter database all_mode CHARACTER SET = utf8mb4;
 
 -- test decimal type
 alter table t1 add column lat decimal(9,6) default '0.000000';
-insert into t1 (id, name, info, lat) values (8, 'gentest', '{"id":127}', '123.123')
+insert into t1 (id, name, info, lat) values (8, 'gentest', '{"id":127}', '123.123');
+
+-- test bit type
+alter table t1 add column bin bit(1) default NULL;
+insert into t1 (id, name, info, lat, bin) values (9, 'gentest', '{"id":128}', '123.123', b'0');
+insert into t1 (id, name, info, lat, bin) values (10, 'gentest', '{"id":129}', '123.123', b'1');
+
+-- test bigint, min and max value for bigint/bigint unsigned
+alter table t1 add column big1 bigint;
+alter table t1 add column big2 bigint unsigned;
+insert into t1 (id, name, info, lat, big1, big2) values (11, 'gentest', '{"id":130}', '123.123', -9223372036854775808, 0);
+insert into t1 (id, name, info, lat, big1, big2) values (12, 'gentest', '{"id":131}', '123.123', 9223372036854775807, 18446744073709551615);
+