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table_source.go
128 lines (111 loc) · 3.12 KB
/
table_source.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 ast
import (
"strings"
)
import (
"github.com/pkg/errors"
)
var (
_ Restorer = (*TableSourceNode)(nil)
_ Node = (*TableSourceNode)(nil)
_ Restorer = (*TableSourceItem)(nil)
)
type TableSourceItem struct {
Source Node // TableName,*SelectStatement,*UnionSelectStatement
Alias string
Partitions []string
IndexHints []*IndexHint
}
func (t *TableSourceItem) Restore(flag RestoreFlag, sb *strings.Builder, args *[]int) error {
switch source := t.Source.(type) {
case TableName:
if err := source.Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
case *SelectStatement:
sb.WriteByte('(')
if err := source.Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
sb.WriteByte(')')
case *UnionSelectStatement:
sb.WriteByte('(')
if err := source.Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
sb.WriteByte(')')
default:
panic("unreachable")
}
if len(t.Partitions) > 0 {
sb.WriteString(" PARTITION (")
WriteID(sb, t.Partitions[0])
for i := 1; i < len(t.Partitions); i++ {
sb.WriteByte(',')
WriteID(sb, t.Partitions[i])
}
sb.WriteByte(')')
}
if len(t.Alias) > 0 {
sb.WriteString(" AS ")
WriteID(sb, t.Alias)
}
if len(t.IndexHints) > 0 {
sb.WriteByte(' ')
if err := t.IndexHints[0].Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
for i := 1; i < len(t.IndexHints); i++ {
sb.WriteString(", ")
if err := t.IndexHints[i].Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
}
}
return nil
}
func (t *TableSourceItem) ResetTableName(newTableName string) bool {
switch source := t.Source.(type) {
case TableName:
newSource := make(TableName, len(source))
copy(newSource, source)
newSource[len(newSource)-1] = newTableName
t.Source = newSource
return true
}
return false
}
type TableSourceNode struct {
TableSourceItem
Joins []*JoinNode
}
func (t *TableSourceNode) Accept(visitor Visitor) (interface{}, error) {
return visitor.VisitTableSource(t)
}
func (t *TableSourceNode) Restore(flag RestoreFlag, sb *strings.Builder, args *[]int) error {
if err := t.TableSourceItem.Restore(flag, sb, args); err != nil {
return err
}
for _, next := range t.Joins {
if err := next.Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
}
return nil
}