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truncate.go
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/
truncate.go
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// Copyright 2015 The Cockroach 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. See the AUTHORS file
// for names of contributors.
//
// Author: XisiHuang (cockhuangxh@163.com)
package sql
import (
"github.com/cockroachdb/cockroach/client"
"github.com/cockroachdb/cockroach/proto"
"github.com/cockroachdb/cockroach/sql/parser"
"github.com/cockroachdb/cockroach/util/log"
)
// Truncate deletes all rows from a table.
func (p *planner) Truncate(n *parser.Truncate) (planNode, error) {
b := client.Batch{}
for _, tableQualifiedName := range n.Tables {
tableDesc, err := p.getTableDesc(tableQualifiedName)
if err != nil {
return nil, err
}
tablePrefix := encodeTablePrefix(tableDesc.ID)
// Delete rows and indexes starting with the table's prefix.
tableStartKey := proto.Key(tablePrefix)
tableEndKey := tableStartKey.PrefixEnd()
if log.V(2) {
log.Infof("DelRange %q - %q", tableStartKey, tableEndKey)
}
b.DelRange(tableStartKey, tableEndKey)
}
if err := p.db.Run(&b); err != nil {
return nil, err
}
// TODO(tamird/pmattis): return the number of affected rows
return &valuesNode{}, nil
}