*: Fix add index after add column with default value (#3510)

Conflicts:
	table/tables/tables.go

ddl/ddl_db_test.go

@@ -154,6 +154,18 @@ func (s *testDBSuite) TestMySQLErrorCode(c *C) {
 	s.testErrorCode(c, sql, tmysql.ErrWrongTableName)
 }
 
+func (s *testDBSuite) TestAddIndexAfterAddColumn(c *C) {
+	defer testleak.AfterTest(c)()
+	s.tk = testkit.NewTestKit(c, s.store)
+	s.tk.MustExec("use " + s.schemaName)
+
+	s.tk.MustExec("create table test_add_index_after_add_col(a int, b int not null default '0')")
+	s.tk.MustExec("insert into test_add_index_after_add_col values(1, 2),(2,2)")
+	s.tk.MustExec("alter table test_add_index_after_add_col add column c int not null default '0'")
+	sql := "alter table test_add_index_after_add_col add unique index cc(c) "
+	s.testErrorCode(c, sql, tmysql.ErrDupEntry)
+}
+
 func (s *testDBSuite) TestIndex(c *C) {
 	defer testleak.AfterTest(c)()
 	s.tk = testkit.NewTestKit(c, s.store)

ddl/index.go

@@ -413,7 +413,9 @@ func (d *ddl) fetchRowColVals(txn kv.Transaction, t table.Table, taskOpInfo *ind
 	}
 
 	cols := t.Cols()
+	ctx := d.newContext()
 	idxInfo := taskOpInfo.tblIndex.Meta()
+	defaultVals := make([]types.Datum, len(cols))
 	for i, idxRecord := range idxRecords {
 		rowMap, err := tablecodec.DecodeRow(rawRecords[i], taskOpInfo.colMap)
 		if err != nil {
@@ -423,7 +425,17 @@ func (d *ddl) fetchRowColVals(txn kv.Transaction, t table.Table, taskOpInfo *ind
 		idxVal := make([]types.Datum, 0, len(idxInfo.Columns))
 		for _, v := range idxInfo.Columns {
 			col := cols[v.Offset]
-			idxVal = append(idxVal, rowMap[col.ID])
+			idxColumnVal := rowMap[col.ID]
+			if _, ok := rowMap[col.ID]; ok {
+				idxVal = append(idxVal, idxColumnVal)
+				continue
+			}
+			idxColumnVal, ret.err = tables.GetColDefaultValue(ctx, col, defaultVals)
+			if ret.err != nil {
+				ret.err = errors.Trace(ret.err)
+				return nil, ret
+			}
+			idxVal = append(idxVal, idxColumnVal)
 		}
 		idxRecord.vals = idxVal
 	}

table/tables/tables.go

@@ -450,33 +450,26 @@ func (t *Table) RowWithCols(ctx context.Context, h int64, cols []*table.Column)
 		}
 		colTps[col.ID] = &col.FieldType
 	}
-	row, err := tablecodec.DecodeRow(value, colTps)
+	rowMap, err := tablecodec.DecodeRow(value, colTps)
 	if err != nil {
 		return nil, errors.Trace(err)
 	}
+	defaultVals := make([]types.Datum, len(cols))
 	for i, col := range cols {
 		if col == nil {
 			continue
 		}
 		if col.IsPKHandleColumn(t.meta) {
 			continue
 		}
-		ri, ok := row[col.ID]
+		ri, ok := rowMap[col.ID]
 		if ok {
 			v[i] = ri
 			continue
 		}
-
-		if col.OriginDefaultValue != nil && col.State == model.StatePublic {
-			ri, err = table.GetColOriginDefaultValue(ctx, col.ToInfo())
-			if err != nil {
-				return nil, errors.Trace(err)
-			}
-			v[i] = ri
-			continue
-		}
-		if mysql.HasNotNullFlag(col.Flag) {
-			return nil, errors.New("Miss column")
+		v[i], err = GetColDefaultValue(ctx, col, defaultVals)
+		if err != nil {
+			return nil, errors.Trace(err)
 		}
 	}
 	return v, nil
@@ -624,29 +617,21 @@ func (t *Table) IterRecords(ctx context.Context, startKey kv.Key, cols []*table.
 		}
 		data := make([]types.Datum, len(cols))
 		for _, col := range cols {
-			if col.IsPKHandleColumn(t.Meta()) {
-				data[col.Offset] = types.NewIntDatum(handle)
+			if col.IsPKHandleColumn(t.meta) {
+				if mysql.HasUnsignedFlag(col.Flag) {
+					data[col.Offset].SetUint64(uint64(handle))
+				} else {
+					data[col.Offset].SetInt64(handle)
+				}
 				continue
 			}
 			if _, ok := rowMap[col.ID]; ok {
 				data[col.Offset] = rowMap[col.ID]
 				continue
 			}
-			if col.OriginDefaultValue == nil && mysql.HasNotNullFlag(col.Flag) {
-				return errors.New("Miss column")
-			}
-			if col.State != model.StatePublic {
-				continue
-			}
-			if defaultVals[col.Offset].IsNull() {
-				d, err := table.GetColOriginDefaultValue(ctx, col.ToInfo())
-				if err != nil {
-					return errors.Trace(err)
-				}
-				data[col.Offset] = d
-				defaultVals[col.Offset] = d
-			} else {
-				data[col.Offset] = defaultVals[col.Offset]
+			data[col.Offset], err = GetColDefaultValue(ctx, col, defaultVals)
+			if err != nil {
+				return errors.Trace(err)
 			}
 		}
 		more, err := fn(handle, data, cols)
@@ -664,6 +649,29 @@ func (t *Table) IterRecords(ctx context.Context, startKey kv.Key, cols []*table.
 	return nil
 }
 
+// GetColDefaultValue gets a column default value.
+// The defaultVals is used to avoid calculating the default value multiple times.
+func GetColDefaultValue(ctx context.Context, col *table.Column, defaultVals []types.Datum) (
+	colVal types.Datum, err error) {
+	if col.OriginDefaultValue == nil && mysql.HasNotNullFlag(col.Flag) {
+		return colVal, errors.New("Miss column")
+	}
+	if col.State != model.StatePublic {
+		return colVal, nil
+	}
+	if defaultVals[col.Offset].IsNull() {
+		colVal, err = table.GetColOriginDefaultValue(ctx, col.ToInfo())
+		if err != nil {
+			return colVal, errors.Trace(err)
+		}
+		defaultVals[col.Offset] = colVal
+	} else {
+		colVal = defaultVals[col.Offset]
+	}
+
+	return colVal, nil
+}
+
 // AllocAutoID implements table.Table AllocAutoID interface.
 func (t *Table) AllocAutoID() (int64, error) {
 	return t.alloc.Alloc(t.ID)