gitea/vendor/github.com/pingcap/tidb/optimizer/validator.go
Thomas Boerger b6a95a8cb3 Integrate public as bindata optionally (#293)
* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix
2016-11-30 00:26:36 +08:00

247 lines
6.3 KiB
Go

// Copyright 2015 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package optimizer
import (
"github.com/juju/errors"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/parser"
"github.com/pingcap/tidb/parser/opcode"
)
// Validate checkes whether the node is valid.
func Validate(node ast.Node, inPrepare bool) error {
v := validator{inPrepare: inPrepare}
node.Accept(&v)
return v.err
}
// validator is an ast.Visitor that validates
// ast Nodes parsed from parser.
type validator struct {
err error
wildCardCount int
inPrepare bool
inAggregate bool
}
func (v *validator) Enter(in ast.Node) (out ast.Node, skipChildren bool) {
switch in.(type) {
case *ast.AggregateFuncExpr:
if v.inAggregate {
// Aggregate function can not contain aggregate function.
v.err = ErrInvalidGroupFuncUse
return in, true
}
v.inAggregate = true
}
return in, false
}
func (v *validator) Leave(in ast.Node) (out ast.Node, ok bool) {
switch x := in.(type) {
case *ast.AggregateFuncExpr:
v.inAggregate = false
case *ast.BetweenExpr:
v.checkAllOneColumn(x.Expr, x.Left, x.Right)
case *ast.BinaryOperationExpr:
v.checkBinaryOperation(x)
case *ast.ByItem:
v.checkAllOneColumn(x.Expr)
case *ast.CreateTableStmt:
v.checkAutoIncrement(x)
case *ast.CompareSubqueryExpr:
v.checkSameColumns(x.L, x.R)
case *ast.FieldList:
v.checkFieldList(x)
case *ast.HavingClause:
v.checkAllOneColumn(x.Expr)
case *ast.IsNullExpr:
v.checkAllOneColumn(x.Expr)
case *ast.IsTruthExpr:
v.checkAllOneColumn(x.Expr)
case *ast.ParamMarkerExpr:
if !v.inPrepare {
v.err = parser.ErrSyntax.Gen("syntax error, unexpected '?'")
}
case *ast.PatternInExpr:
v.checkSameColumns(append(x.List, x.Expr)...)
}
return in, v.err == nil
}
// checkAllOneColumn checks that all expressions have one column.
// Expression may have more than one column when it is a rowExpr or
// a Subquery with more than one result fields.
func (v *validator) checkAllOneColumn(exprs ...ast.ExprNode) {
for _, expr := range exprs {
switch x := expr.(type) {
case *ast.RowExpr:
v.err = ErrOneColumn
case *ast.SubqueryExpr:
if len(x.Query.GetResultFields()) != 1 {
v.err = ErrOneColumn
}
}
}
return
}
func checkAutoIncrementOp(colDef *ast.ColumnDef, num int) (bool, error) {
var hasAutoIncrement bool
if colDef.Options[num].Tp == ast.ColumnOptionAutoIncrement {
hasAutoIncrement = true
if len(colDef.Options) == num+1 {
return hasAutoIncrement, nil
}
for _, op := range colDef.Options[num+1:] {
if op.Tp == ast.ColumnOptionDefaultValue {
return hasAutoIncrement, errors.Errorf("Invalid default value for '%s'", colDef.Name.Name.O)
}
}
}
if colDef.Options[num].Tp == ast.ColumnOptionDefaultValue && len(colDef.Options) != num+1 {
for _, op := range colDef.Options[num+1:] {
if op.Tp == ast.ColumnOptionAutoIncrement {
return hasAutoIncrement, errors.Errorf("Invalid default value for '%s'", colDef.Name.Name.O)
}
}
}
return hasAutoIncrement, nil
}
func isConstraintKeyTp(constraints []*ast.Constraint, colDef *ast.ColumnDef) bool {
for _, c := range constraints {
if len(c.Keys) < 1 {
}
// If the constraint as follows: primary key(c1, c2)
// we only support c1 column can be auto_increment.
if colDef.Name.Name.L != c.Keys[0].Column.Name.L {
continue
}
switch c.Tp {
case ast.ConstraintPrimaryKey, ast.ConstraintKey, ast.ConstraintIndex,
ast.ConstraintUniq, ast.ConstraintUniqIndex, ast.ConstraintUniqKey:
return true
}
}
return false
}
func (v *validator) checkAutoIncrement(stmt *ast.CreateTableStmt) {
var (
isKey bool
count int
autoIncrementCol *ast.ColumnDef
)
for _, colDef := range stmt.Cols {
var hasAutoIncrement bool
for i, op := range colDef.Options {
ok, err := checkAutoIncrementOp(colDef, i)
if err != nil {
v.err = err
return
}
if ok {
hasAutoIncrement = true
}
switch op.Tp {
case ast.ColumnOptionPrimaryKey, ast.ColumnOptionUniqKey, ast.ColumnOptionUniqIndex,
ast.ColumnOptionUniq, ast.ColumnOptionKey, ast.ColumnOptionIndex:
isKey = true
}
}
if hasAutoIncrement {
count++
autoIncrementCol = colDef
}
}
if count < 1 {
return
}
if !isKey {
isKey = isConstraintKeyTp(stmt.Constraints, autoIncrementCol)
}
if !isKey || count > 1 {
v.err = errors.New("Incorrect table definition; there can be only one auto column and it must be defined as a key")
}
switch autoIncrementCol.Tp.Tp {
case mysql.TypeTiny, mysql.TypeShort, mysql.TypeLong,
mysql.TypeFloat, mysql.TypeDouble, mysql.TypeLonglong, mysql.TypeInt24:
default:
v.err = errors.Errorf("Incorrect column specifier for column '%s'", autoIncrementCol.Name.Name.O)
}
}
func (v *validator) checkBinaryOperation(x *ast.BinaryOperationExpr) {
// row constructor only supports comparison operation.
switch x.Op {
case opcode.LT, opcode.LE, opcode.GE, opcode.GT, opcode.EQ, opcode.NE, opcode.NullEQ:
v.checkSameColumns(x.L, x.R)
default:
v.checkAllOneColumn(x.L, x.R)
}
}
func columnCount(ex ast.ExprNode) int {
switch x := ex.(type) {
case *ast.RowExpr:
return len(x.Values)
case *ast.SubqueryExpr:
return len(x.Query.GetResultFields())
default:
return 1
}
}
func (v *validator) checkSameColumns(exprs ...ast.ExprNode) {
if len(exprs) == 0 {
return
}
count := columnCount(exprs[0])
for i := 1; i < len(exprs); i++ {
if columnCount(exprs[i]) != count {
v.err = ErrSameColumns
return
}
}
}
// checkFieldList checks if there is only one '*' and each field has only one column.
func (v *validator) checkFieldList(x *ast.FieldList) {
var hasWildCard bool
for _, val := range x.Fields {
if val.WildCard != nil && val.WildCard.Table.L == "" {
if hasWildCard {
v.err = ErrMultiWildCard
return
}
hasWildCard = true
}
v.checkAllOneColumn(val.Expr)
if v.err != nil {
return
}
}
}