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online_ddl.go
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online_ddl.go
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/*
Copyright 2020 The Vitess Authors.
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,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package engine
import (
"context"
"fmt"
"vitess.io/vitess/go/sqltypes"
"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/sqlparser"
"vitess.io/vitess/go/vt/vterrors"
"vitess.io/vitess/go/vt/vtgate/vindexes"
)
var _ Primitive = (*OnlineDDL)(nil)
// OnlineDDL represents the instructions to perform an online schema change via vtctld
type OnlineDDL struct {
Keyspace *vindexes.Keyspace
DDL sqlparser.DDLStatement
SQL string
DDLStrategySetting *schema.DDLStrategySetting
// TargetDestination specifies an explicit target destination to send the query to.
TargetDestination key.Destination
noTxNeeded
noInputs
}
func (v *OnlineDDL) description() PrimitiveDescription {
return PrimitiveDescription{
OperatorType: "OnlineDDL",
Keyspace: v.Keyspace,
Other: map[string]any{
"query": v.SQL,
},
}
}
// RouteType implements the Primitive interface
func (v *OnlineDDL) RouteType() string {
return "OnlineDDL"
}
// GetKeyspaceName implements the Primitive interface
func (v *OnlineDDL) GetKeyspaceName() string {
return v.Keyspace.Name
}
// GetTableName implements the Primitive interface
func (v *OnlineDDL) GetTableName() string {
return v.DDL.GetTable().Name.String()
}
// TryExecute implements the Primitive interface
func (v *OnlineDDL) TryExecute(ctx context.Context, vcursor VCursor, bindVars map[string]*querypb.BindVariable, wantfields bool) (result *sqltypes.Result, err error) {
result = &sqltypes.Result{
Fields: []*querypb.Field{
{
Name: "uuid",
Type: sqltypes.VarChar,
},
},
Rows: [][]sqltypes.Value{},
}
onlineDDLs, err := schema.NewOnlineDDLs(v.GetKeyspaceName(), v.SQL, v.DDL,
v.DDLStrategySetting, fmt.Sprintf("vtgate:%s", vcursor.Session().GetSessionUUID()), "",
)
if err != nil {
return result, err
}
for _, onlineDDL := range onlineDDLs {
// Go directly to tablets, much like Send primitive does
s := Send{
Keyspace: v.Keyspace,
TargetDestination: v.TargetDestination,
Query: onlineDDL.SQL,
IsDML: false,
SingleShardOnly: false,
}
if _, err := vcursor.ExecutePrimitive(ctx, &s, bindVars, wantfields); err != nil {
return result, err
}
result.Rows = append(result.Rows, []sqltypes.Value{
sqltypes.NewVarChar(onlineDDL.UUID),
})
}
return result, err
}
// TryStreamExecute implements the Primitive interface
func (v *OnlineDDL) TryStreamExecute(ctx context.Context, vcursor VCursor, bindVars map[string]*querypb.BindVariable, wantfields bool, callback func(*sqltypes.Result) error) error {
results, err := v.TryExecute(ctx, vcursor, bindVars, wantfields)
if err != nil {
return err
}
return callback(results)
}
// GetFields implements the Primitive interface
func (v *OnlineDDL) GetFields(ctx context.Context, vcursor VCursor, bindVars map[string]*querypb.BindVariable) (*sqltypes.Result, error) {
return nil, vterrors.Errorf(vtrpcpb.Code_INTERNAL, "[BUG] GetFields is not reachable")
}