ddl: store default value as string when value type is binary or bit

ddl/db_integration_test.go

@@ -1430,3 +1430,13 @@ func (s *testIntegrationSuite) TestIgnoreColumnUTF8Charset(c *C) {
  " `b` varchar(50) CHARACTER SET ascii COLLATE ascii_bin DEFAULT NULL\n" +
  ") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin"))
 }
+
+func (s *testIntegrationSuite) TestDefaultValueIsString(c *C) {
+ s.tk = testkit.NewTestKit(c, s.store)
+ s.tk.MustExec("use test")
+ s.tk.MustExec("drop table if exists t")
+ defer s.tk.MustExec("drop table if exists t")
+ s.tk.MustExec("create table t (a int default b'1');")
+ tbl := testGetTableByName(c, s.ctx, "test", "t")
+ c.Assert(tbl.Meta().Columns[0].DefaultValue, Equals, "1")
+}

ddl/ddl_api.go

@@ -21,6 +21,7 @@ import (
  "bytes"
  "context"
  "fmt"
+ "strconv"
  "strings"
  "sync/atomic"
  "time"
@@ -533,8 +534,12 @@ func getDefaultValue(ctx sessionctx.Context, colName string, c *ast.ColumnOption
  // its raw string content here.
  return v.GetBinaryLiteral().ToString(), nil
  }
- // For other kind of fields (e.g. INT), we supply its integer value so that it acts as integers.
- return v.GetBinaryLiteral().ToInt(ctx.GetSessionVars().StmtCtx)
+ // For other kind of fields (e.g. INT), we supply its integer as string value.
+ value, err := v.GetBinaryLiteral().ToInt(ctx.GetSessionVars().StmtCtx)
+ if err != nil {
+ return nil, err
+ }
+ return strconv.FormatUint(value, 10), nil
  }
 
  if tp == mysql.TypeDuration {