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ddl.go
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ddl.go
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// Copyright 2020 Pilosa Corp.
//
// 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 sql
import (
"context"
"fmt"
"github.com/pilosa/pilosa/v2"
pproto "github.com/pilosa/pilosa/v2/proto"
"github.com/pkg/errors"
"vitess.io/vitess/go/vt/sqlparser"
)
// DDLHandler executes CREATE, ALTER, DROP, RENAME, TRUNCATE or ANALYZE statement.
type DDLHandler struct {
api *pilosa.API
}
// NewDDLHandler constructor
func NewDDLHandler(api *pilosa.API) *DDLHandler {
return &DDLHandler{
api: api,
}
}
// Handle executes mapped SQL
func (h *DDLHandler) Handle(ctx context.Context, mapped *MappedSQL) (pproto.ToRowser, error) {
stmt, ok := mapped.Statement.(*sqlparser.DDL)
if !ok {
return nil, fmt.Errorf("statement is not type DDL: %T", mapped.Statement)
}
switch stmt.Action {
case sqlparser.DropStr:
return h.execDropTable(ctx, stmt)
default:
return nil, errors.Errorf("unsupported DDL action: %s", stmt.Action)
}
}
func (h *DDLHandler) execDropTable(ctx context.Context, stmt *sqlparser.DDL) (pproto.ToRowser, error) {
if n := len(stmt.FromTables); n != 1 {
return nil, fmt.Errorf("statement can only contain a single drop table, but got: %d", n)
}
indexName := stmt.FromTables[0].ToViewName().Name.String()
if err := h.api.DeleteIndex(ctx, indexName); err != nil {
return nil, errors.Wrapf(err, "deleting index %s", indexName)
}
return pproto.ConstRowser{}, nil
}