From 0fbce9c0197753fe0411177e70c9e71ecb5d5469 Mon Sep 17 00:00:00 2001
From: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Date: Sun, 15 Nov 2020 13:59:25 +0200
Subject: [PATCH 1/5] Adding ddl_strategy session variable

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
---
 go/test/endtoend/onlineddl/onlineddl_test.go | 38 ++++++++++++--------
 go/vt/schema/online_ddl.go                   | 13 +++++++
 go/vt/schema/online_ddl_test.go              | 22 ++++++++++++
 go/vt/sqlparser/expression_rewriting.go      |  1 +
 go/vt/sqlparser/expression_rewriting_test.go |  6 ++++
 go/vt/sysvars/sysvars.go                     |  3 ++
 go/vt/vtgate/engine/fake_vcursor_test.go     |  4 +++
 go/vt/vtgate/engine/primitive.go             |  2 ++
 go/vt/vtgate/engine/set.go                   | 11 ++++++
 go/vt/vtgate/safe_session.go                 |  8 +++++
 go/vt/vtgate/vcursor_impl.go                 |  5 +++
 proto/vtgate.proto                           |  3 ++
 12 files changed, 102 insertions(+), 14 deletions(-)

diff --git a/go/test/endtoend/onlineddl/onlineddl_test.go b/go/test/endtoend/onlineddl/onlineddl_test.go
index 41f63843ef3..3ec883c7071 100644
--- a/go/test/endtoend/onlineddl/onlineddl_test.go
+++ b/go/test/endtoend/onlineddl/onlineddl_test.go
@@ -46,18 +46,22 @@ var (
 		msg varchar(64),
 		PRIMARY KEY (id)
 		) ENGINE=InnoDB;`
+	// To verify non online-DDL behavior
+	alterTableNormalStatement = `
+		ALTER TABLE %s
+		ADD COLUMN non_online INT UNSIGNED NOT NULL`
 	// The following statement is valid
-	alterTableSuccessfulStatament = `
+	alterTableSuccessfulStatement = `
 		ALTER WITH 'gh-ost' TABLE %s
 		MODIFY id BIGINT UNSIGNED NOT NULL,
 		ADD COLUMN ghost_col INT NOT NULL,
 		ADD INDEX idx_msg(msg)`
 	// The following statement will fail because gh-ost requires some shared unique key
-	alterTableFailedStatament = `
+	alterTableFailedStatement = `
 		ALTER WITH 'gh-ost' TABLE %s
 		DROP PRIMARY KEY,
 		DROP COLUMN ghost_col`
-	alterTableThrottlingStatament = `
+	alterTableThrottlingStatement = `
 		ALTER WITH 'gh-ost' '--max-load=Threads_running=1' TABLE %s
 		DROP COLUMN ghost_col`
 )
@@ -123,20 +127,23 @@ func TestSchemaChange(t *testing.T) {
 	assert.Equal(t, 2, len(clusterInstance.Keyspaces[0].Shards))
 	testWithInitialSchema(t)
 	{
-		uuid := testAlterTable(t, alterTableSuccessfulStatament)
+		_ = testAlterTable(t, alterTableNormalStatement, false, "non_online")
+	}
+	{
+		uuid := testAlterTable(t, alterTableSuccessfulStatement, true, "ghost_col")
 		checkRecentMigrations(t, uuid, schema.OnlineDDLStatusComplete)
 		checkCancelMigration(t, uuid, false)
 		checkRetryMigration(t, uuid, false)
 	}
 	{
-		uuid := testAlterTable(t, alterTableThrottlingStatament)
+		uuid := testAlterTable(t, alterTableThrottlingStatement, true, "ghost_col")
 		checkRecentMigrations(t, uuid, schema.OnlineDDLStatusRunning)
 		checkCancelMigration(t, uuid, true)
 		time.Sleep(2 * time.Second)
 		checkRecentMigrations(t, uuid, schema.OnlineDDLStatusFailed)
 	}
 	{
-		uuid := testAlterTable(t, alterTableFailedStatament)
+		uuid := testAlterTable(t, alterTableFailedStatement, true, "ghost_col")
 		checkRecentMigrations(t, uuid, schema.OnlineDDLStatusFailed)
 		checkCancelMigration(t, uuid, false)
 		checkRetryMigration(t, uuid, true)
@@ -157,16 +164,20 @@ func testWithInitialSchema(t *testing.T) {
 }
 
 // testAlterTable runs an online DDL, ALTER statement
-func testAlterTable(t *testing.T, alterStatement string) (uuid string) {
+func testAlterTable(t *testing.T, alterStatement string, isOnlineDDL bool, expectColumn string) (uuid string) {
 	tableName := fmt.Sprintf("vt_onlineddl_test_%02d", 3)
 	sqlQuery := fmt.Sprintf(alterStatement, tableName)
 	uuid, err := clusterInstance.VtctlclientProcess.ApplySchemaWithOutput(keyspaceName, sqlQuery)
 	require.Nil(t, err)
 	uuid = strings.TrimSpace(uuid)
-	require.NotEmpty(t, uuid)
-	// Migration is asynchronous. Give it some time.
-	time.Sleep(time.Second * 20)
-	checkMigratedTable(t, tableName)
+	if isOnlineDDL {
+		require.NotEmpty(t, uuid)
+		// Migration is asynchronous. Give it some time.
+		time.Sleep(time.Second * 20)
+	} else {
+		require.Empty(t, uuid)
+	}
+	checkMigratedTable(t, tableName, expectColumn)
 	return uuid
 }
 
@@ -239,11 +250,10 @@ func checkRetryMigration(t *testing.T, uuid string, expectRetryPossible bool) {
 }
 
 // checkMigratedTables checks the CREATE STATEMENT of a table after migration
-func checkMigratedTable(t *testing.T, tableName string) {
-	expect := "ghost_col"
+func checkMigratedTable(t *testing.T, tableName, expectColumn string) {
 	for i := range clusterInstance.Keyspaces[0].Shards {
 		createStatement := getCreateTableStatement(t, clusterInstance.Keyspaces[0].Shards[i].Vttablets[0], tableName)
-		assert.Contains(t, createStatement, expect)
+		assert.Contains(t, createStatement, expectColumn)
 	}
 }
 
diff --git a/go/vt/schema/online_ddl.go b/go/vt/schema/online_ddl.go
index 9d6c736f8c1..644a7382548 100644
--- a/go/vt/schema/online_ddl.go
+++ b/go/vt/schema/online_ddl.go
@@ -99,6 +99,19 @@ type OnlineDDL struct {
 	Retries     int64                 `json:"retries,omitempty"`
 }
 
+func ValidateDDLStrategy(strategy string) (sqlparser.DDLStrategy, error) {
+	switch sqlparser.DDLStrategy(strategy) {
+	case DDLStrategyGhost:
+		return DDLStrategyGhost, nil
+	case DDLStrategyPTOSC:
+		return DDLStrategyPTOSC, nil
+	case DDLStrategyNormal:
+		return DDLStrategyNormal, nil
+	default:
+		return DDLStrategyNormal, fmt.Errorf("Unknown online DDL strategy: '%v'", strategy)
+	}
+}
+
 // FromJSON creates an OnlineDDL from json
 func FromJSON(bytes []byte) (*OnlineDDL, error) {
 	onlineDDL := &OnlineDDL{}
diff --git a/go/vt/schema/online_ddl_test.go b/go/vt/schema/online_ddl_test.go
index 4475fcc632c..f0bf0e9b5f2 100644
--- a/go/vt/schema/online_ddl_test.go
+++ b/go/vt/schema/online_ddl_test.go
@@ -27,6 +27,28 @@ func TestCreateUUID(t *testing.T) {
 	assert.NoError(t, err)
 }
 
+func TestValidateDDLStrategy(t *testing.T) {
+	{
+		strategy, err := ValidateDDLStrategy("gh-ost")
+		assert.NoError(t, err)
+		assert.Equal(t, DDLStrategyGhost, strategy)
+	}
+	{
+		strategy, err := ValidateDDLStrategy("pt-osc")
+		assert.NoError(t, err)
+		assert.Equal(t, DDLStrategyPTOSC, strategy)
+	}
+	{
+		strategy, err := ValidateDDLStrategy("")
+		assert.NoError(t, err)
+		assert.Equal(t, DDLStrategyNormal, strategy)
+	}
+	{
+		_, err := ValidateDDLStrategy("other")
+		assert.Error(t, err)
+	}
+}
+
 func TestIsOnlineDDLUUID(t *testing.T) {
 	for i := 0; i < 20; i++ {
 		uuid, err := CreateUUID()
diff --git a/go/vt/sqlparser/expression_rewriting.go b/go/vt/sqlparser/expression_rewriting.go
index 444a01d6137..7fc90d779d3 100644
--- a/go/vt/sqlparser/expression_rewriting.go
+++ b/go/vt/sqlparser/expression_rewriting.go
@@ -127,6 +127,7 @@ func (er *expressionRewriter) sysVarRewrite(cursor *Cursor, node *ColName) {
 		sysvars.SQLSelectLimit.Name,
 		sysvars.TransactionMode.Name,
 		sysvars.Workload.Name,
+		sysvars.DDLStrategy.Name,
 		sysvars.ReadAfterWriteGTID.Name,
 		sysvars.ReadAfterWriteTimeOut.Name,
 		sysvars.SessionTrackGTIDs.Name:
diff --git a/go/vt/sqlparser/expression_rewriting_test.go b/go/vt/sqlparser/expression_rewriting_test.go
index 1d5cf1eff63..25a3a0abbc2 100644
--- a/go/vt/sqlparser/expression_rewriting_test.go
+++ b/go/vt/sqlparser/expression_rewriting_test.go
@@ -28,6 +28,7 @@ import (
 type myTestCase struct {
 	in, expected                                                      string
 	liid, db, foundRows, rowCount, rawGTID, rawTimeout, sessTrackGTID bool
+	ddlStrategy                                                       bool
 	udv                                                               int
 	autocommit, clientFoundRows, skipQueryPlanCache                   bool
 	sqlSelectLimit, transactionMode, workload                         bool
@@ -145,6 +146,10 @@ func TestRewrites(in *testing.T) {
 		in:       `select (select (select (select (select (select last_insert_id()))))) as x`,
 		expected: "select :__lastInsertId as x from dual",
 		liid:     true,
+	}, {
+		in:          `select * from user where col = @@ddl_strategy`,
+		expected:    "select * from user where col = :__vtddl_strategy",
+		ddlStrategy: true,
 	}, {
 		in:       `select * from user where col = @@read_after_write_gtid OR col = @@read_after_write_timeout OR col = @@session_track_gtids`,
 		expected: "select * from user where col = :__vtread_after_write_gtid or col = :__vtread_after_write_timeout or col = :__vtsession_track_gtids",
@@ -177,6 +182,7 @@ func TestRewrites(in *testing.T) {
 			assert.Equal(tc.sqlSelectLimit, result.NeedsSysVar(sysvars.SQLSelectLimit.Name), "should need :__vtsqlSelectLimit")
 			assert.Equal(tc.transactionMode, result.NeedsSysVar(sysvars.TransactionMode.Name), "should need :__vttransactionMode")
 			assert.Equal(tc.workload, result.NeedsSysVar(sysvars.Workload.Name), "should need :__vtworkload")
+			assert.Equal(tc.ddlStrategy, result.NeedsSysVar(sysvars.DDLStrategy.Name), "should need ddlStrategy")
 			assert.Equal(tc.rawGTID, result.NeedsSysVar(sysvars.ReadAfterWriteGTID.Name), "should need rawGTID")
 			assert.Equal(tc.rawTimeout, result.NeedsSysVar(sysvars.ReadAfterWriteTimeOut.Name), "should need rawTimeout")
 			assert.Equal(tc.sessTrackGTID, result.NeedsSysVar(sysvars.SessionTrackGTIDs.Name), "should need sessTrackGTID")
diff --git a/go/vt/sysvars/sysvars.go b/go/vt/sysvars/sysvars.go
index 88543366db9..2fa219fa2f6 100644
--- a/go/vt/sysvars/sysvars.go
+++ b/go/vt/sysvars/sysvars.go
@@ -53,6 +53,8 @@ var (
 	Workload            = SystemVariable{Name: "workload", IdentifierAsString: true}
 	Charset             = SystemVariable{Name: "charset", Default: utf8, IdentifierAsString: true}
 	Names               = SystemVariable{Name: "names", Default: utf8, IdentifierAsString: true}
+	// Online DDL
+	DDLStrategy = SystemVariable{Name: "ddl_strategy", IdentifierAsString: true}
 
 	// Read After Write settings
 	ReadAfterWriteGTID    = SystemVariable{Name: "read_after_write_gtid"}
@@ -67,6 +69,7 @@ var (
 		TransactionReadOnly,
 		SQLSelectLimit,
 		TransactionMode,
+		DDLStrategy,
 		Workload,
 		Charset,
 		Names,
diff --git a/go/vt/vtgate/engine/fake_vcursor_test.go b/go/vt/vtgate/engine/fake_vcursor_test.go
index bf6e699400e..cea216e3310 100644
--- a/go/vt/vtgate/engine/fake_vcursor_test.go
+++ b/go/vt/vtgate/engine/fake_vcursor_test.go
@@ -57,6 +57,10 @@ type noopVCursor struct {
 	ctx context.Context
 }
 
+func (t noopVCursor) SetDDLStrategy(strategy sqlparser.DDLStrategy) {
+	panic("implement me")
+}
+
 func (t noopVCursor) SetReadAfterWriteGTID(s string) {
 	panic("implement me")
 }
diff --git a/go/vt/vtgate/engine/primitive.go b/go/vt/vtgate/engine/primitive.go
index c95965ebe59..8577632fef0 100644
--- a/go/vt/vtgate/engine/primitive.go
+++ b/go/vt/vtgate/engine/primitive.go
@@ -126,6 +126,8 @@ type (
 		SetWorkload(querypb.ExecuteOptions_Workload)
 		SetFoundRows(uint64)
 
+		SetDDLStrategy(sqlparser.DDLStrategy)
+
 		// SetReadAfterWriteGTID sets the GTID that the user expects a replica to have caught up with before answering a query
 		SetReadAfterWriteGTID(string)
 		SetReadAfterWriteTimeout(float64)
diff --git a/go/vt/vtgate/engine/set.go b/go/vt/vtgate/engine/set.go
index 1bbea6a6a08..655f3f1ba43 100644
--- a/go/vt/vtgate/engine/set.go
+++ b/go/vt/vtgate/engine/set.go
@@ -36,6 +36,7 @@ import (
 	"vitess.io/vitess/go/vt/key"
 	querypb "vitess.io/vitess/go/vt/proto/query"
 	vtrpcpb "vitess.io/vitess/go/vt/proto/vtrpc"
+	"vitess.io/vitess/go/vt/schema"
 	"vitess.io/vitess/go/vt/vterrors"
 	"vitess.io/vitess/go/vt/vtgate/vindexes"
 )
@@ -398,6 +399,16 @@ func (svss *SysVarSetAware) Execute(vcursor VCursor, env evalengine.ExpressionEn
 			return vterrors.Errorf(vtrpcpb.Code_INVALID_ARGUMENT, "invalid workload: %s", str)
 		}
 		vcursor.Session().SetWorkload(querypb.ExecuteOptions_Workload(out))
+	case sysvars.DDLStrategy.Name:
+		str, err := svss.evalAsString(env)
+		if err != nil {
+			return err
+		}
+		strategy, err := schema.ValidateDDLStrategy(str)
+		if err != nil {
+			return vterrors.Errorf(vtrpcpb.Code_INVALID_ARGUMENT, "invalid DDL strategy: %s", str)
+		}
+		vcursor.Session().SetDDLStrategy(strategy)
 	case sysvars.Charset.Name, sysvars.Names.Name:
 		str, err := svss.evalAsString(env)
 		if err != nil {
diff --git a/go/vt/vtgate/safe_session.go b/go/vt/vtgate/safe_session.go
index 0906c45e98b..7f76725c98f 100644
--- a/go/vt/vtgate/safe_session.go
+++ b/go/vt/vtgate/safe_session.go
@@ -22,6 +22,7 @@ import (
 	"time"
 
 	"github.com/golang/protobuf/proto"
+	"vitess.io/vitess/go/vt/sqlparser"
 	"vitess.io/vitess/go/vt/vterrors"
 
 	querypb "vitess.io/vitess/go/vt/proto/query"
@@ -453,6 +454,13 @@ func (session *SafeSession) ResetShard(tabletAlias *topodatapb.TabletAlias) erro
 	return nil
 }
 
+// SetDDLStrategy set the DDLStrategy setting.
+func (session *SafeSession) SetDDLStrategy(strategy sqlparser.DDLStrategy) {
+	session.mu.Lock()
+	defer session.mu.Unlock()
+	// session.DDLStrategy = string(strategy)
+}
+
 // SetReadAfterWriteGTID set the ReadAfterWriteGtid setting.
 func (session *SafeSession) SetReadAfterWriteGTID(vtgtid string) {
 	session.mu.Lock()
diff --git a/go/vt/vtgate/vcursor_impl.go b/go/vt/vtgate/vcursor_impl.go
index 0999c146cce..3d970dee2aa 100644
--- a/go/vt/vtgate/vcursor_impl.go
+++ b/go/vt/vtgate/vcursor_impl.go
@@ -585,6 +585,11 @@ func (vc *vcursorImpl) SetFoundRows(foundRows uint64) {
 	vc.safeSession.foundRowsHandled = true
 }
 
+// SetReadAfterWriteGTID implements the SessionActions interface
+func (vc *vcursorImpl) SetDDLStrategy(strategy sqlparser.DDLStrategy) {
+	vc.safeSession.SetDDLStrategy(strategy)
+}
+
 // SetReadAfterWriteGTID implements the SessionActions interface
 func (vc *vcursorImpl) SetReadAfterWriteGTID(vtgtid string) {
 	vc.safeSession.SetReadAfterWriteGTID(vtgtid)
diff --git a/proto/vtgate.proto b/proto/vtgate.proto
index 5dbc3665282..2e3318b51cf 100644
--- a/proto/vtgate.proto
+++ b/proto/vtgate.proto
@@ -137,6 +137,9 @@ message Session {
 
   // read_after_write tracks the ReadAfterWrite settings for this session.
   ReadAfterWrite read_after_write = 20;
+
+  // DDL strategy
+  string DDLStrategy = 21;
 }
 
 // ReadAfterWrite contains information regarding gtid set and timeout

From b64957396981db80a1ba4260192bf25d58612c32 Mon Sep 17 00:00:00 2001
From: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Date: Sun, 15 Nov 2020 15:40:47 +0200
Subject: [PATCH 2/5] vtgate protoc

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
---
 go/vt/proto/vtgate/vtgate.pb.go | 181 +++++++++++++++++---------------
 1 file changed, 96 insertions(+), 85 deletions(-)

diff --git a/go/vt/proto/vtgate/vtgate.pb.go b/go/vt/proto/vtgate/vtgate.pb.go
index 1f576baffd8..c3c84d1cb51 100644
--- a/go/vt/proto/vtgate/vtgate.pb.go
+++ b/go/vt/proto/vtgate/vtgate.pb.go
@@ -152,10 +152,12 @@ type Session struct {
 	// last_lock_heartbeat keep tracks of when last lock heartbeat was sent.
 	LastLockHeartbeat int64 `protobuf:"varint,19,opt,name=last_lock_heartbeat,json=lastLockHeartbeat,proto3" json:"last_lock_heartbeat,omitempty"`
 	// read_after_write tracks the ReadAfterWrite settings for this session.
-	ReadAfterWrite       *ReadAfterWrite `protobuf:"bytes,20,opt,name=read_after_write,json=readAfterWrite,proto3" json:"read_after_write,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}        `json:"-"`
-	XXX_unrecognized     []byte          `json:"-"`
-	XXX_sizecache        int32           `json:"-"`
+	ReadAfterWrite *ReadAfterWrite `protobuf:"bytes,20,opt,name=read_after_write,json=readAfterWrite,proto3" json:"read_after_write,omitempty"`
+	// DDL strategy
+	DDLStrategy          string   `protobuf:"bytes,21,opt,name=DDLStrategy,proto3" json:"DDLStrategy,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *Session) Reset()         { *m = Session{} }
@@ -316,6 +318,13 @@ func (m *Session) GetReadAfterWrite() *ReadAfterWrite {
 	return nil
 }
 
+func (m *Session) GetDDLStrategy() string {
+	if m != nil {
+		return m.DDLStrategy
+	}
+	return ""
+}
+
 type Session_ShardSession struct {
 	Target        *query.Target         `protobuf:"bytes,1,opt,name=target,proto3" json:"target,omitempty"`
 	TransactionId int64                 `protobuf:"varint,2,opt,name=transaction_id,json=transactionId,proto3" json:"transaction_id,omitempty"`
@@ -1083,88 +1092,90 @@ func init() {
 func init() { proto.RegisterFile("vtgate.proto", fileDescriptor_aab96496ceaf1ebb) }
 
 var fileDescriptor_aab96496ceaf1ebb = []byte{
-	// 1328 bytes of a gzipped FileDescriptorProto
+	// 1346 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xb4, 0x57, 0xdd, 0x6e, 0x1b, 0xb7,
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+	0x08, 0x69, 0xc3, 0x42, 0x58, 0x16, 0x6b, 0x11, 0x27, 0xfa, 0x2e, 0x32, 0xd7, 0x2c, 0x0e, 0x70,
+	0xf4, 0x09, 0x84, 0xb5, 0xe1, 0xaa, 0xd9, 0x98, 0x9a, 0x62, 0x28, 0x6f, 0x6f, 0xac, 0x56, 0x51,
+	0x7f, 0x36, 0xa6, 0x18, 0xd4, 0xfc, 0x5b, 0x17, 0xe9, 0x05, 0x9d, 0xc9, 0x31, 0x19, 0x50, 0xd7,
+	0x0c, 0x26, 0x33, 0x40, 0xf2, 0xb8, 0x14, 0x69, 0x4d, 0xe5, 0xc7, 0x07, 0x4c, 0xf6, 0x26, 0x03,
+	0xe6, 0x79, 0x2a, 0x97, 0xb6, 0x33, 0xb5, 0x9f, 0x2c, 0xa8, 0xcc, 0x33, 0x25, 0xc7, 0xdc, 0x97,
+	0x7a, 0xc7, 0x34, 0x15, 0x82, 0x8b, 0x95, 0x34, 0xe1, 0xc3, 0x56, 0x5b, 0xab, 0x71, 0x80, 0xbe,
+	0x49, 0x8e, 0x1e, 0x43, 0x46, 0x50, 0x39, 0x19, 0xa9, 0x30, 0x49, 0x28, 0x3e, 0x86, 0xb0, 0x41,
+	0x70, 0x68, 0x51, 0xfb, 0x23, 0x01, 0xeb, 0x61, 0x44, 0xbb, 0x44, 0x0d, 0xce, 0xdf, 0x3b, 0x81,
+	0xff, 0x87, 0xac, 0x8e, 0x86, 0x51, 0x5d, 0x50, 0xc9, 0xeb, 0x29, 0x8c, 0x2c, 0xde, 0x81, 0x44,
+	0x22, 0x97, 0xde, 0x2b, 0xe9, 0xe0, 0xbd, 0x42, 0x64, 0xfc, 0xbd, 0xf2, 0x9e, 0xb8, 0xae, 0xfd,
+	0x6c, 0xc1, 0xc6, 0x72, 0x4e, 0xdf, 0x1b, 0xd5, 0x1f, 0x42, 0x36, 0x20, 0x32, 0xca, 0xe6, 0xed,
+	0x30, 0xb6, 0x80, 0xe6, 0x13, 0xa6, 0xce, 0x03, 0xd7, 0x91, 0x99, 0x6e, 0xd6, 0x8d, 0x9e, 0x12,
+	0x94, 0x5c, 0xbe, 0x53, 0xcb, 0xce, 0xfb, 0x30, 0xf1, 0x66, 0x7d, 0x98, 0x7c, 0xeb, 0x3e, 0x4c,
+	0xbd, 0x86, 0x9b, 0xf4, 0x8d, 0x1e, 0x7a, 0xb1, 0xdc, 0x66, 0xfe, 0x39, 0xb7, 0xb5, 0x16, 0x6c,
+	0xae, 0x24, 0x2a, 0xa4, 0x71, 0xd1, 0x5f, 0xd6, 0x6b, 0xfb, 0xeb, 0x07, 0xb8, 0x83, 0xa9, 0xe4,
+	0xa3, 0x29, 0x8d, 0x55, 0xde, 0xdb, 0xa5, 0x1c, 0x41, 0xca, 0x53, 0xe1, 0xd4, 0xcc, 0x63, 0xf3,
+	0x5d, 0xbb, 0x0b, 0x5b, 0xd7, 0xb9, 0x0f, 0x02, 0xad, 0xfd, 0x6e, 0x41, 0xf9, 0x38, 0x38, 0xc3,
+	0xdb, 0x6d, 0xb9, 0x42, 0x5e, 0xe2, 0x86, 0xe4, 0x3d, 0x84, 0xf4, 0xd4, 0x0c, 0xa7, 0xe8, 0x92,
+	0x8e, 0xfd, 0x0f, 0x39, 0xd6, 0x33, 0x03, 0x07, 0xb8, 0xce, 0xe4, 0x19, 0x1b, 0x29, 0x2a, 0x0c,
+	0xbb, 0x3a, 0x93, 0x31, 0xcb, 0xa7, 0x06, 0xc1, 0xa1, 0x45, 0xed, 0x4b, 0xa8, 0xcc, 0xcf, 0xb2,
+	0x20, 0x82, 0x4e, 0xa9, 0x7e, 0xa4, 0x59, 0xa6, 0xf8, 0x97, 0x96, 0x1f, 0xb7, 0x35, 0x84, 0x43,
+	0x8b, 0xc7, 0x7b, 0x50, 0x59, 0x79, 0xc1, 0xa3, 0x0a, 0x14, 0x8e, 0x5e, 0xf4, 0x0e, 0xdb, 0xad,
+	0xce, 0xd3, 0x4e, 0x7b, 0xcf, 0xbe, 0x85, 0x00, 0x32, 0xbd, 0xce, 0x8b, 0x67, 0xfb, 0x6d, 0xdb,
+	0x42, 0x79, 0x48, 0x1f, 0x1c, 0xed, 0xf7, 0x3b, 0x76, 0x42, 0x7f, 0xf6, 0x4f, 0xba, 0x87, 0x2d,
+	0x3b, 0xf9, 0xf8, 0x0b, 0x28, 0xb4, 0xcc, 0xff, 0x90, 0xae, 0xf0, 0xa8, 0xd0, 0x0b, 0x5e, 0x74,
+	0xf1, 0xc1, 0xce, 0xbe, 0x7d, 0x0b, 0x65, 0x21, 0x79, 0x88, 0xf5, 0xca, 0x1c, 0xa4, 0x0e, 0xbb,
+	0xbd, 0xbe, 0x9d, 0x40, 0x65, 0x80, 0x9d, 0xa3, 0x7e, 0xb7, 0xd5, 0x3d, 0x38, 0xe8, 0xf4, 0xed,
+	0xe4, 0xee, 0xa7, 0x50, 0x61, 0xbc, 0x31, 0x65, 0x8a, 0x4a, 0x19, 0xfc, 0xcd, 0xfa, 0xee, 0x5e,
+	0x28, 0x31, 0xde, 0x0c, 0xbe, 0x9a, 0x43, 0xde, 0x9c, 0xaa, 0xa6, 0x41, 0x9b, 0x41, 0x69, 0x9e,
+	0x66, 0x8c, 0xf4, 0xf1, 0x5f, 0x01, 0x00, 0x00, 0xff, 0xff, 0x70, 0xa7, 0x77, 0x23, 0xe6, 0x0d,
+	0x00, 0x00,
 }

From ad264f509856ba135e64e304e709a3499eca16e3 Mon Sep 17 00:00:00 2001
From: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Date: Sun, 15 Nov 2020 16:12:43 +0200
Subject: [PATCH 3/5] session now knows the new ddl_strategy variable

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
---
 go/mysql/endtoend/client_test.go     | 17 +++++++++++++++++
 go/vt/vtgate/executor.go             |  2 ++
 go/vt/vtgate/executor_select_test.go |  5 ++++-
 go/vt/vtgate/safe_session.go         |  2 +-
 4 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/go/mysql/endtoend/client_test.go b/go/mysql/endtoend/client_test.go
index c19f302b195..fbaaddbc5b4 100644
--- a/go/mysql/endtoend/client_test.go
+++ b/go/mysql/endtoend/client_test.go
@@ -339,3 +339,20 @@ func TestSessionTrackGTIDs(t *testing.T) {
 	require.NoError(t, err)
 	require.NotEmpty(t, qr.SessionStateChanges)
 }
+
+func TestDDLStrategy(t *testing.T) {
+	ctx := context.Background()
+	params := connParams
+	params.Flags |= mysql.CapabilityClientSessionTrack
+	conn, err := mysql.Connect(ctx, &params)
+	require.NoError(t, err)
+
+	_, err = conn.ExecuteFetch(`set session ddl_strategy='gh-ost'`, 1000, false)
+	require.NoError(t, err)
+	_, err = conn.ExecuteFetch(`set session ddl_strategy='pot-osc'`, 1000, false)
+	require.NoError(t, err)
+	_, err = conn.ExecuteFetch(`set session ddl_strategy=''`, 1000, false)
+	require.NoError(t, err)
+	_, err = conn.ExecuteFetch(`set session ddl_strategy='other'`, 1000, false)
+	require.Error(t, err)
+}
diff --git a/go/vt/vtgate/executor.go b/go/vt/vtgate/executor.go
index 736ff01adc4..fa82862ea9f 100644
--- a/go/vt/vtgate/executor.go
+++ b/go/vt/vtgate/executor.go
@@ -290,6 +290,8 @@ func (e *Executor) addNeededBindVars(bindVarNeeds *sqlparser.BindVarNeeds, bindV
 				v = options.GetWorkload().String()
 			})
 			bindVars[key] = sqltypes.StringBindVariable(v)
+		case sysvars.DDLStrategy.Name:
+			bindVars[key] = sqltypes.StringBindVariable(session.DDLStrategy)
 		case sysvars.ReadAfterWriteGTID.Name:
 			var v string
 			ifReadAfterWriteExist(session, func(raw *vtgatepb.ReadAfterWrite) {
diff --git a/go/vt/vtgate/executor_select_test.go b/go/vt/vtgate/executor_select_test.go
index c5b4c0c071d..bcf200b4322 100644
--- a/go/vt/vtgate/executor_select_test.go
+++ b/go/vt/vtgate/executor_select_test.go
@@ -328,7 +328,8 @@ func TestSelectSystemVariables(t *testing.T) {
 
 	sql := "select @@autocommit, @@client_found_rows, @@skip_query_plan_cache, " +
 		"@@sql_select_limit, @@transaction_mode, @@workload, @@read_after_write_gtid, " +
-		"@@read_after_write_timeout, @@session_track_gtids"
+		"@@read_after_write_timeout, @@session_track_gtids" +
+		"@@ddl_strategy"
 	result, err := executorExec(executor, sql, map[string]*querypb.BindVariable{})
 	wantResult := &sqltypes.Result{
 		Fields: []*querypb.Field{
@@ -341,6 +342,7 @@ func TestSelectSystemVariables(t *testing.T) {
 			{Name: "@@read_after_write_gtid", Type: sqltypes.VarBinary},
 			{Name: "@@read_after_write_timeout", Type: sqltypes.Float64},
 			{Name: "@@session_track_gtids", Type: sqltypes.VarBinary},
+			{Name: "@@ddl_strategy", Type: sqltypes.VarBinary},
 		},
 		RowsAffected: 1,
 		Rows: [][]sqltypes.Value{{
@@ -355,6 +357,7 @@ func TestSelectSystemVariables(t *testing.T) {
 			sqltypes.NewVarBinary("a fine gtid"),
 			sqltypes.NewFloat64(13),
 			sqltypes.NewVarBinary("own_gtid"),
+			sqltypes.NewVarBinary(""),
 		}},
 	}
 	require.NoError(t, err)
diff --git a/go/vt/vtgate/safe_session.go b/go/vt/vtgate/safe_session.go
index 7f76725c98f..a5ef0ebb032 100644
--- a/go/vt/vtgate/safe_session.go
+++ b/go/vt/vtgate/safe_session.go
@@ -458,7 +458,7 @@ func (session *SafeSession) ResetShard(tabletAlias *topodatapb.TabletAlias) erro
 func (session *SafeSession) SetDDLStrategy(strategy sqlparser.DDLStrategy) {
 	session.mu.Lock()
 	defer session.mu.Unlock()
-	// session.DDLStrategy = string(strategy)
+	session.DDLStrategy = string(strategy)
 }
 
 // SetReadAfterWriteGTID set the ReadAfterWriteGtid setting.

From c6fb4e0a1bc405288f622529ada4b1b0bced76cc Mon Sep 17 00:00:00 2001
From: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Date: Sun, 15 Nov 2020 19:51:01 +0200
Subject: [PATCH 4/5] fix unit test

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
---
 go/vt/vtgate/executor_select_test.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/go/vt/vtgate/executor_select_test.go b/go/vt/vtgate/executor_select_test.go
index bcf200b4322..95a2357d671 100644
--- a/go/vt/vtgate/executor_select_test.go
+++ b/go/vt/vtgate/executor_select_test.go
@@ -328,8 +328,8 @@ func TestSelectSystemVariables(t *testing.T) {
 
 	sql := "select @@autocommit, @@client_found_rows, @@skip_query_plan_cache, " +
 		"@@sql_select_limit, @@transaction_mode, @@workload, @@read_after_write_gtid, " +
-		"@@read_after_write_timeout, @@session_track_gtids" +
-		"@@ddl_strategy"
+		"@@read_after_write_timeout, @@session_track_gtids, @@ddl_strategy"
+
 	result, err := executorExec(executor, sql, map[string]*querypb.BindVariable{})
 	wantResult := &sqltypes.Result{
 		Fields: []*querypb.Field{

From b1dfc291a2fdf1b9af4cd5f6d9a371a55258a5a2 Mon Sep 17 00:00:00 2001
From: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Date: Sun, 15 Nov 2020 19:58:05 +0200
Subject: [PATCH 5/5] removed TestDDLStrategy. It was misplaced

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
---
 go/mysql/endtoend/client_test.go | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/go/mysql/endtoend/client_test.go b/go/mysql/endtoend/client_test.go
index fbaaddbc5b4..c19f302b195 100644
--- a/go/mysql/endtoend/client_test.go
+++ b/go/mysql/endtoend/client_test.go
@@ -339,20 +339,3 @@ func TestSessionTrackGTIDs(t *testing.T) {
 	require.NoError(t, err)
 	require.NotEmpty(t, qr.SessionStateChanges)
 }
-
-func TestDDLStrategy(t *testing.T) {
-	ctx := context.Background()
-	params := connParams
-	params.Flags |= mysql.CapabilityClientSessionTrack
-	conn, err := mysql.Connect(ctx, &params)
-	require.NoError(t, err)
-
-	_, err = conn.ExecuteFetch(`set session ddl_strategy='gh-ost'`, 1000, false)
-	require.NoError(t, err)
-	_, err = conn.ExecuteFetch(`set session ddl_strategy='pot-osc'`, 1000, false)
-	require.NoError(t, err)
-	_, err = conn.ExecuteFetch(`set session ddl_strategy=''`, 1000, false)
-	require.NoError(t, err)
-	_, err = conn.ExecuteFetch(`set session ddl_strategy='other'`, 1000, false)
-	require.Error(t, err)
-}