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truncate.go
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truncate.go
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// Copyright 2020-2021 Dolthub, Inc.
//
// 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 plan
import (
"gopkg.in/src-d/go-errors.v1"
"github.com/dolthub/go-mysql-server/sql/types"
"github.com/dolthub/go-mysql-server/sql"
)
var ErrTruncateNotSupported = errors.NewKind("table doesn't support TRUNCATE")
// Truncate is a node describing the deletion of all rows from some table.
type Truncate struct {
db string
UnaryNode
}
var _ sql.Node = (*Truncate)(nil)
var _ sql.DebugStringer = (*Truncate)(nil)
var _ sql.CollationCoercible = (*Truncate)(nil)
// NewTruncate creates a Truncate node.
func NewTruncate(db string, table sql.Node) *Truncate {
return &Truncate{
db: db,
UnaryNode: UnaryNode{table},
}
}
func GetTruncatable(node sql.Node) (sql.TruncateableTable, error) {
switch node := node.(type) {
case sql.TruncateableTable:
return node, nil
case *IndexedTableAccess:
return GetTruncatable(node.TableNode)
case *ResolvedTable:
return getTruncatableTable(node.Table)
case sql.TableWrapper:
return getTruncatableTable(node.Underlying())
}
for _, child := range node.Children() {
truncater, _ := GetTruncatable(child)
if truncater != nil {
return truncater, nil
}
}
return nil, ErrTruncateNotSupported.New()
}
func getTruncatableTable(t sql.Table) (sql.TruncateableTable, error) {
switch t := t.(type) {
case sql.TruncateableTable:
return t, nil
case sql.TableWrapper:
return getTruncatableTable(t.Underlying())
default:
return nil, ErrTruncateNotSupported.New()
}
}
// DatabaseName returns the name of the database that this operation is being performed in.
func (p *Truncate) DatabaseName() string {
return p.db
}
// Schema implements the Node interface.
func (p *Truncate) Schema() sql.Schema {
return types.OkResultSchema
}
// WithChildren implements the Node interface.
func (p *Truncate) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(p, len(children), 1)
}
nt := *p
nt.UnaryNode = UnaryNode{children[0]}
return &nt, nil
}
// CheckPrivileges implements the interface sql.Node.
func (p *Truncate) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
subject := sql.PrivilegeCheckSubject{
Database: p.db,
Table: getTableName(p.Child),
}
return opChecker.UserHasPrivileges(ctx,
sql.NewPrivilegedOperation(subject, sql.PrivilegeType_Drop))
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*Truncate) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}
func (*Truncate) IsReadOnly() bool {
return false
}
// String implements the Node interface.
func (p Truncate) String() string {
pr := sql.NewTreePrinter()
_ = pr.WriteNode("Truncate")
_ = pr.WriteChildren(p.Child.String())
return pr.String()
}
// DebugString implements the DebugStringer interface.
func (p Truncate) DebugString() string {
pr := sql.NewTreePrinter()
_ = pr.WriteNode("Truncate")
_ = pr.WriteChildren(sql.DebugString(p.Child))
return pr.String()
}