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bdr.go
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bdr.go
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// Copyright 2024 PingCAP, 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 ddl
import (
"github.com/pingcap/tidb/pkg/parser/ast"
"github.com/pingcap/tidb/pkg/types"
)
// In BDR mode(primary role), we allow add a new column to table if it is nullable
// or not null with default value.
func deniedByBDRWhenAddColumn(options []*ast.ColumnOption) bool {
var (
nullable bool
notNull bool
defaultValue bool
comment int
generated int
)
for _, opt := range options {
switch opt.Tp {
case ast.ColumnOptionDefaultValue:
defaultValue = true
case ast.ColumnOptionComment:
comment = 1
case ast.ColumnOptionGenerated:
generated = 1
case ast.ColumnOptionNotNull:
notNull = true
case ast.ColumnOptionNull:
nullable = true
}
}
tpLen := len(options) - comment - generated
if tpLen == 0 || (tpLen == 1 && nullable) || (tpLen == 1 && !notNull && defaultValue) ||
(tpLen == 2 && notNull && defaultValue) {
return false
}
return true
}
// In BDR mode(primary role), we allow add or update comment for column, change default
// value of one particular column. Other modify column operations are denied.
func deniedByBDRWhenModifyColumn(newFieldType, oldFieldType types.FieldType, options []*ast.ColumnOption) bool {
if !newFieldType.Equal(&oldFieldType) {
return true
}
var (
defaultValue bool
comment bool
)
for _, opt := range options {
if opt.Tp == ast.ColumnOptionDefaultValue {
defaultValue = true
}
if opt.Tp == ast.ColumnOptionComment {
comment = true
}
}
if len(options) == 1 && defaultValue {
return false
}
if len(options) == 2 && defaultValue && comment {
return false
}
return true
}