Improved Compatibility Around LAST_INSERT_ID

go/mysql/conn.go

@@ -399,7 +399,7 @@ func (c *Conn) readHeaderFrom(r io.Reader) (int, error) {
 		return 0, vterrors.Wrapf(err, "io.ReadFull(header size) failed")
 	}
 
-	sequence := uint8(c.header[3])
+	sequence := c.header[3]
 	if sequence != c.sequence {
 		return 0, vterrors.Errorf(vtrpcpb.Code_INTERNAL, "invalid sequence, expected %v got %v", c.sequence, sequence)
 	}

go/mysql/query.go

@@ -404,6 +404,7 @@ func (c *Conn) ReadQueryResult(maxrows int, wantfields bool) (*sqltypes.Result,
 		return &sqltypes.Result{
 			RowsAffected:        packetOk.affectedRows,
 			InsertID:            packetOk.lastInsertID,
+			InsertIDChanged:     packetOk.lastInsertID > 0,
 			SessionStateChanges: packetOk.sessionStateData,
 			StatusFlags:         packetOk.statusFlags,
 			Info:                packetOk.info,

go/mysql/query_test.go

@@ -22,17 +22,13 @@ import (
 	"sync"
 	"testing"
 
-	"google.golang.org/protobuf/proto"
-
-	"vitess.io/vitess/go/mysql/sqlerror"
-
-	"vitess.io/vitess/go/mysql/collations"
-
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"google.golang.org/protobuf/proto"
 
+	"vitess.io/vitess/go/mysql/collations"
+	"vitess.io/vitess/go/mysql/sqlerror"
 	"vitess.io/vitess/go/sqltypes"
-
 	querypb "vitess.io/vitess/go/vt/proto/query"
 )
 
@@ -393,8 +389,9 @@ func TestQueries(t *testing.T) {
 
 	// Typical Insert result
 	checkQuery(t, "insert", sConn, cConn, &sqltypes.Result{
-		RowsAffected: 0x8010203040506070,
-		InsertID:     0x0102030405060708,
+		RowsAffected:    0x8010203040506070,
+		InsertID:        0x0102030405060708,
+		InsertIDChanged: true,
 	})
 
 	// Typical Select with TYPE_AND_NAME.
@@ -702,6 +699,7 @@ func checkQueryInternal(t *testing.T, query string, sConn, cConn *Conn, result *
 		got = &sqltypes.Result{}
 		got.RowsAffected = result.RowsAffected
 		got.InsertID = result.InsertID
+		got.InsertIDChanged = result.InsertIDUpdated()
 		got.Fields, err = cConn.Fields()
 		if err != nil {
 			fatalError = fmt.Sprintf("Fields(%v) failed: %v", query, err)

go/sqltypes/proto3.go

@@ -103,6 +103,7 @@ func ResultToProto3(qr *Result) *querypb.QueryResult {
 		Fields:              qr.Fields,
 		RowsAffected:        qr.RowsAffected,
 		InsertId:            qr.InsertID,
+		InsertIdChanged:     qr.InsertIDChanged,
 		Rows:                RowsToProto3(qr.Rows),
 		Info:                qr.Info,
 		SessionStateChanges: qr.SessionStateChanges,
@@ -119,6 +120,7 @@ func Proto3ToResult(qr *querypb.QueryResult) *Result {
 		Fields:              qr.Fields,
 		RowsAffected:        qr.RowsAffected,
 		InsertID:            qr.InsertId,
+		InsertIDChanged:     qr.InsertIdChanged,
 		Rows:                proto3ToRows(qr.Fields, qr.Rows),
 		Info:                qr.Info,
 		SessionStateChanges: qr.SessionStateChanges,
@@ -136,6 +138,7 @@ func CustomProto3ToResult(fields []*querypb.Field, qr *querypb.QueryResult) *Res
 		Fields:              qr.Fields,
 		RowsAffected:        qr.RowsAffected,
 		InsertID:            qr.InsertId,
+		InsertIDChanged:     qr.InsertIdChanged,
 		Rows:                proto3ToRows(fields, qr.Rows),
 		Info:                qr.Info,
 		SessionStateChanges: qr.SessionStateChanges,

go/sqltypes/proto3_test.go

@@ -39,9 +39,10 @@ func TestResult(t *testing.T) {
 		Type: Float64,
 	}}
 	sqlResult := &Result{
-		Fields:       fields,
-		InsertID:     1,
-		RowsAffected: 2,
+		Fields:          fields,
+		InsertID:        1,
+		InsertIDChanged: true,
+		RowsAffected:    2,
 		Rows: [][]Value{{
 			TestValue(VarChar, "aa"),
 			TestValue(Int64, "1"),
@@ -53,9 +54,10 @@ func TestResult(t *testing.T) {
 		}},
 	}
 	p3Result := &querypb.QueryResult{
-		Fields:       fields,
-		InsertId:     1,
-		RowsAffected: 2,
+		Fields:          fields,
+		InsertId:        1,
+		InsertIdChanged: true,
+		RowsAffected:    2,
 		Rows: []*querypb.Row{{
 			Lengths: []int64{2, 1, 1},
 			Values:  []byte("aa12"),
@@ -105,36 +107,40 @@ func TestResults(t *testing.T) {
 		Type: Float64,
 	}}
 	sqlResults := []Result{{
-		Fields:       fields1,
-		InsertID:     1,
-		RowsAffected: 2,
+		Fields:          fields1,
+		InsertID:        1,
+		InsertIDChanged: true,
+		RowsAffected:    2,
 		Rows: [][]Value{{
 			TestValue(VarChar, "aa"),
 			TestValue(Int64, "1"),
 			TestValue(Float64, "2"),
 		}},
 	}, {
-		Fields:       fields2,
-		InsertID:     3,
-		RowsAffected: 4,
+		Fields:          fields2,
+		InsertID:        3,
+		InsertIDChanged: true,
+		RowsAffected:    4,
 		Rows: [][]Value{{
 			TestValue(VarChar, "bb"),
 			TestValue(Int64, "3"),
 			TestValue(Float64, "4"),
 		}},
 	}}
 	p3Results := []*querypb.QueryResult{{
-		Fields:       fields1,
-		InsertId:     1,
-		RowsAffected: 2,
+		Fields:          fields1,
+		InsertId:        1,
+		InsertIdChanged: true,
+		RowsAffected:    2,
 		Rows: []*querypb.Row{{
 			Lengths: []int64{2, 1, 1},
 			Values:  []byte("aa12"),
 		}},
 	}, {
-		Fields:       fields2,
-		InsertId:     3,
-		RowsAffected: 4,
+		Fields:          fields2,
+		InsertId:        3,
+		InsertIdChanged: true,
+		RowsAffected:    4,
 		Rows: []*querypb.Row{{
 			Lengths: []int64{2, 1, 1},
 			Values:  []byte("bb34"),
@@ -176,9 +182,10 @@ func TestQueryReponses(t *testing.T) {
 	queryResponses := []QueryResponse{
 		{
 			QueryResult: &Result{
-				Fields:       fields1,
-				InsertID:     1,
-				RowsAffected: 2,
+				Fields:          fields1,
+				InsertID:        1,
+				InsertIDChanged: true,
+				RowsAffected:    2,
 				Rows: [][]Value{{
 					TestValue(VarChar, "aa"),
 					TestValue(Int64, "1"),
@@ -188,9 +195,10 @@ func TestQueryReponses(t *testing.T) {
 			QueryError: nil,
 		}, {
 			QueryResult: &Result{
-				Fields:       fields2,
-				InsertID:     3,
-				RowsAffected: 4,
+				Fields:          fields2,
+				InsertID:        3,
+				InsertIDChanged: true,
+				RowsAffected:    4,
 				Rows: [][]Value{{
 					TestValue(VarChar, "bb"),
 					TestValue(Int64, "3"),
@@ -208,9 +216,10 @@ func TestQueryReponses(t *testing.T) {
 		{
 			Error: nil,
 			Result: &querypb.QueryResult{
-				Fields:       fields1,
-				InsertId:     1,
-				RowsAffected: 2,
+				Fields:          fields1,
+				InsertId:        1,
+				InsertIdChanged: true,
+				RowsAffected:    2,
 				Rows: []*querypb.Row{{
 					Lengths: []int64{2, 1, 1},
 					Values:  []byte("aa12"),
@@ -219,9 +228,10 @@ func TestQueryReponses(t *testing.T) {
 		}, {
 			Error: nil,
 			Result: &querypb.QueryResult{
-				Fields:       fields2,
-				InsertId:     3,
-				RowsAffected: 4,
+				Fields:          fields2,
+				InsertId:        3,
+				InsertIdChanged: true,
+				RowsAffected:    4,
 				Rows: []*querypb.Row{{
 					Lengths: []int64{2, 1, 1},
 					Values:  []byte("bb34"),

go/sqltypes/result.go

@@ -31,6 +31,7 @@ type Result struct {
 	Fields              []*querypb.Field `json:"fields"`
 	RowsAffected        uint64           `json:"rows_affected"`
 	InsertID            uint64           `json:"insert_id"`
+	InsertIDChanged     bool             `json:"insert_id_changed"`
 	Rows                []Row            `json:"rows"`
 	SessionStateChanges string           `json:"session_state_changes"`
 	StatusFlags         uint16           `json:"status_flags"`
@@ -92,6 +93,7 @@ func (result *Result) Copy() *Result {
 	out := &Result{
 		RowsAffected:        result.RowsAffected,
 		InsertID:            result.InsertID,
+		InsertIDChanged:     result.InsertIDUpdated(),
 		SessionStateChanges: result.SessionStateChanges,
 		StatusFlags:         result.StatusFlags,
 		Info:                result.Info,
@@ -116,6 +118,7 @@ func (result *Result) ShallowCopy() *Result {
 	return &Result{
 		Fields:              result.Fields,
 		InsertID:            result.InsertID,
+		InsertIDChanged:     result.InsertIDChanged,
 		RowsAffected:        result.RowsAffected,
 		Info:                result.Info,
 		SessionStateChanges: result.SessionStateChanges,
@@ -129,6 +132,7 @@ func (result *Result) Metadata() *Result {
 	return &Result{
 		Fields:              result.Fields,
 		InsertID:            result.InsertID,
+		InsertIDChanged:     result.InsertIDUpdated(),
 		RowsAffected:        result.RowsAffected,
 		Info:                result.Info,
 		SessionStateChanges: result.SessionStateChanges,
@@ -153,6 +157,7 @@ func (result *Result) Truncate(l int) *Result {
 
 	out := &Result{
 		InsertID:            result.InsertID,
+		InsertIDChanged:     result.InsertIDUpdated(),
 		RowsAffected:        result.RowsAffected,
 		Info:                result.Info,
 		SessionStateChanges: result.SessionStateChanges,
@@ -198,6 +203,7 @@ func (result *Result) Equal(other *Result) bool {
 	return FieldsEqual(result.Fields, other.Fields) &&
 		result.RowsAffected == other.RowsAffected &&
 		result.InsertID == other.InsertID &&
+		result.InsertIDChanged == other.InsertIDChanged &&
 		slices.EqualFunc(result.Rows, other.Rows, func(a, b Row) bool {
 			return RowEqual(a, b)
 		})
@@ -324,16 +330,14 @@ func (result *Result) StripMetadata(incl querypb.ExecuteOptions_IncludedFields)
 // to another result.Note currently it doesn't handle cases like
 // if two results have different fields.We will enhance this function.
 func (result *Result) AppendResult(src *Result) {
-	if src.RowsAffected == 0 && len(src.Rows) == 0 && len(src.Fields) == 0 {
-		return
+	result.RowsAffected += src.RowsAffected
+	if src.InsertIDUpdated() {
+		result.InsertID = src.InsertID
 	}
+	result.InsertIDChanged = result.InsertIDUpdated() || src.InsertIDUpdated()
 	if result.Fields == nil {
 		result.Fields = src.Fields
 	}
-	result.RowsAffected += src.RowsAffected
-	if src.InsertID != 0 {
-		result.InsertID = src.InsertID
-	}
 	result.Rows = append(result.Rows, src.Rows...)
 }
 
@@ -351,3 +355,7 @@ func (result *Result) IsMoreResultsExists() bool {
 func (result *Result) IsInTransaction() bool {
 	return result.StatusFlags&ServerStatusInTrans == ServerStatusInTrans
 }
+
+func (result *Result) InsertIDUpdated() bool {
+	return result.InsertIDChanged || result.InsertID > 0
+}

go/sqltypes/result_test.go

@@ -57,8 +57,9 @@ func TestCopy(t *testing.T) {
 		}, {
 			Type: VarChar,
 		}},
-		InsertID:     1,
-		RowsAffected: 2,
+		InsertID:        1,
+		InsertIDChanged: true,
+		RowsAffected:    2,
 		Rows: [][]Value{
 			{TestValue(Int64, "1"), MakeTrusted(Null, nil)},
 			{TestValue(Int64, "2"), MakeTrusted(VarChar, nil)},
@@ -76,8 +77,9 @@ func TestTruncate(t *testing.T) {
 		}, {
 			Type: VarChar,
 		}},
-		InsertID:     1,
-		RowsAffected: 2,
+		InsertID:        1,
+		InsertIDChanged: true,
+		RowsAffected:    2,
 		Rows: [][]Value{
 			{TestValue(Int64, "1"), MakeTrusted(Null, nil)},
 			{TestValue(Int64, "2"), MakeTrusted(VarChar, nil)},
@@ -95,8 +97,9 @@ func TestTruncate(t *testing.T) {
 		Fields: []*querypb.Field{{
 			Type: Int64,
 		}},
-		InsertID:     1,
-		RowsAffected: 2,
+		InsertID:        1,
+		InsertIDChanged: true,
+		RowsAffected:    2,
 		Rows: [][]Value{
 			{TestValue(Int64, "1")},
 			{TestValue(Int64, "2")},
@@ -305,8 +308,9 @@ func TestAppendResult(t *testing.T) {
 		}, {
 			Type: VarChar,
 		}},
-		InsertID:     1,
-		RowsAffected: 2,
+		InsertIDChanged: true,
+		InsertID:        1,
+		RowsAffected:    2,
 		Rows: [][]Value{
 			{TestValue(Int64, "2"), MakeTrusted(VarChar, nil)},
 			{TestValue(Int64, "3"), TestValue(VarChar, "")},
@@ -319,8 +323,9 @@ func TestAppendResult(t *testing.T) {
 		}, {
 			Type: VarChar,
 		}},
-		InsertID:     3,
-		RowsAffected: 4,
+		InsertID:        3,
+		InsertIDChanged: true,
+		RowsAffected:    4,
 		Rows: [][]Value{
 			{TestValue(Int64, "1"), MakeTrusted(Null, nil)},
 		},
@@ -332,8 +337,9 @@ func TestAppendResult(t *testing.T) {
 		}, {
 			Type: VarChar,
 		}},
-		InsertID:     1,
-		RowsAffected: 6,
+		InsertID:        1,
+		InsertIDChanged: true,
+		RowsAffected:    6,
 		Rows: [][]Value{
 			{TestValue(Int64, "1"), MakeTrusted(Null, nil)},
 			{TestValue(Int64, "2"), MakeTrusted(VarChar, nil)},

go/test/endtoend/utils/cmp.go

@@ -313,3 +313,10 @@ func (mcmp *MySQLCompare) ExecAllowError(query string) (*sqltypes.Result, error)
 	}
 	return vtQr, vtErr
 }
+
+func (mcmp *MySQLCompare) VExplain(query string) string {
+	mcmp.t.Helper()
+	vtQr, vtErr := mcmp.VtConn.ExecuteFetch("vexplain plan "+query, 1, true)
+	require.NoError(mcmp.t, vtErr, "[Vitess Error] for query: "+query)
+	return vtQr.Rows[0][0].ToString()
+}