diff --git a/server/column.go b/server/column.go
index 850b02eb3097c..567392f02e241 100644
--- a/server/column.go
+++ b/server/column.go
@@ -17,6 +17,8 @@ import (
 	"github.com/pingcap/parser/mysql"
 )
 
+const maxColumnNameSize = 256
+
 // ColumnInfo contains information of a column
 type ColumnInfo struct {
 	Schema             string
@@ -35,12 +37,19 @@ type ColumnInfo struct {
 
 // Dump dumps ColumnInfo to bytes.
 func (column *ColumnInfo) Dump(buffer []byte) []byte {
+	nameDump, orgnameDump := []byte(column.Name), []byte(column.OrgName)
+	if len(nameDump) > maxColumnNameSize {
+		nameDump = nameDump[0:maxColumnNameSize]
+	}
+	if len(orgnameDump) > maxColumnNameSize {
+		orgnameDump = orgnameDump[0:maxColumnNameSize]
+	}
 	buffer = dumpLengthEncodedString(buffer, []byte("def"))
 	buffer = dumpLengthEncodedString(buffer, []byte(column.Schema))
 	buffer = dumpLengthEncodedString(buffer, []byte(column.Table))
 	buffer = dumpLengthEncodedString(buffer, []byte(column.OrgTable))
-	buffer = dumpLengthEncodedString(buffer, []byte(column.Name))
-	buffer = dumpLengthEncodedString(buffer, []byte(column.OrgName))
+	buffer = dumpLengthEncodedString(buffer, nameDump)
+	buffer = dumpLengthEncodedString(buffer, orgnameDump)
 
 	buffer = append(buffer, 0x0c)
 
diff --git a/server/column_test.go b/server/column_test.go
new file mode 100644
index 0000000000000..c87f972811aed
--- /dev/null
+++ b/server/column_test.go
@@ -0,0 +1,76 @@
+// Copyright 2019 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package server
+
+import (
+	. "github.com/pingcap/check"
+	"github.com/pingcap/parser/mysql"
+)
+
+type ColumnTestSuite struct {
+}
+
+var _ = Suite(new(ColumnTestSuite))
+
+func (s ColumnTestSuite) TestDumpColumn(c *C) {
+	info := ColumnInfo{
+		Schema:             "testSchema",
+		Table:              "testTable",
+		OrgTable:           "testOrgTable",
+		Name:               "testName",
+		OrgName:            "testOrgName",
+		ColumnLength:       1,
+		Charset:            106,
+		Flag:               0,
+		Decimal:            1,
+		Type:               14,
+		DefaultValueLength: 2,
+		DefaultValue:       []byte{5, 2},
+	}
+	r := info.Dump(nil)
+	exp := []byte{0x3, 0x64, 0x65, 0x66, 0xa, 0x74, 0x65, 0x73, 0x74, 0x53, 0x63, 0x68, 0x65, 0x6d, 0x61, 0x9, 0x74, 0x65, 0x73, 0x74, 0x54, 0x61, 0x62, 0x6c, 0x65, 0xc, 0x74, 0x65, 0x73, 0x74, 0x4f, 0x72, 0x67, 0x54, 0x61, 0x62, 0x6c, 0x65, 0x8, 0x74, 0x65, 0x73, 0x74, 0x4e, 0x61, 0x6d, 0x65, 0xb, 0x74, 0x65, 0x73, 0x74, 0x4f, 0x72, 0x67, 0x4e, 0x61, 0x6d, 0x65, 0xc, 0x6a, 0x0, 0x1, 0x0, 0x0, 0x0, 0xe, 0x0, 0x0, 0x1, 0x0, 0x0, 0x2, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x5, 0x2}
+	c.Assert(r, DeepEquals, exp)
+
+	c.Assert(dumpFlag(mysql.TypeSet, 0), Equals, uint16(mysql.SetFlag))
+	c.Assert(dumpFlag(mysql.TypeEnum, 0), Equals, uint16(mysql.EnumFlag))
+	c.Assert(dumpFlag(mysql.TypeString, 0), Equals, uint16(0))
+
+	c.Assert(dumpType(mysql.TypeSet), Equals, mysql.TypeString)
+	c.Assert(dumpType(mysql.TypeEnum), Equals, mysql.TypeString)
+	c.Assert(dumpType(mysql.TypeBit), Equals, mysql.TypeBit)
+}
+
+func (s ColumnTestSuite) TestColumnNameLimit(c *C) {
+	aLongName := make([]byte, 0, 300)
+	for i := 0; i < 300; i++ {
+		aLongName = append(aLongName, 'a')
+	}
+	info := ColumnInfo{
+		Schema:             "testSchema",
+		Table:              "testTable",
+		OrgTable:           "testOrgTable",
+		Name:               string(aLongName),
+		OrgName:            "testOrgName",
+		ColumnLength:       1,
+		Charset:            106,
+		Flag:               0,
+		Decimal:            1,
+		Type:               14,
+		DefaultValueLength: 2,
+		DefaultValue:       []byte{5, 2},
+	}
+	r := info.Dump(nil)
+	exp := []byte{0x3, 0x64, 0x65, 0x66, 0xa, 0x74, 0x65, 0x73, 0x74, 0x53, 0x63, 0x68, 0x65, 0x6d, 0x61, 0x9, 0x74, 0x65, 0x73, 0x74, 0x54, 0x61, 0x62, 0x6c, 0x65, 0xc, 0x74, 0x65, 0x73, 0x74, 0x4f, 0x72, 0x67, 0x54, 0x61, 0x62, 0x6c, 0x65, 0xfc, 0x0, 0x1, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0xb, 0x74, 0x65, 0x73, 0x74, 0x4f, 0x72, 0x67, 0x4e, 0x61, 0x6d, 0x65, 0xc, 0x6a, 0x0, 0x1, 0x0, 0x0, 0x0, 0xe, 0x0, 0x0, 0x1, 0x0, 0x0, 0x2, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x5, 0x2}
+	c.Assert(r, DeepEquals, exp)
+}