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2884 lines (2538 loc) · 62.9 KB
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/*
Copyright 2017 Google 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 sqlparser
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"log"
"strings"
"github.com/xwb1989/sqlparser/dependency/querypb"
"github.com/xwb1989/sqlparser/dependency/sqltypes"
)
// Instructions for creating new types: If a type
// needs to satisfy an interface, declare that function
// along with that interface. This will help users
// identify the list of types to which they can assert
// those interfaces.
// If the member of a type has a string with a predefined
// list of values, declare those values as const following
// the type.
// For interfaces that define dummy functions to consolidate
// a set of types, define the function as iTypeName.
// This will help avoid name collisions.
// Parse parses the SQL in full and returns a Statement, which
// is the AST representation of the query. If a DDL statement
// is partially parsed but still contains a syntax error, the
// error is ignored and the DDL is returned anyway.
func Parse(sql string) (Statement, error) {
tokenizer := NewStringTokenizer(sql)
if yyParse(tokenizer) != 0 {
if tokenizer.partialDDL != nil {
log.Printf("ignoring error parsing DDL '%s': %v", sql, tokenizer.LastError)
tokenizer.ParseTree = tokenizer.partialDDL
return tokenizer.ParseTree, nil
}
return nil, tokenizer.LastError
}
return tokenizer.ParseTree, nil
}
// ParseStrictDDL is the same as Parse except it errors on
// partially parsed DDL statements.
func ParseStrictDDL(sql string) (Statement, error) {
tokenizer := NewStringTokenizer(sql)
if yyParse(tokenizer) != 0 {
return nil, tokenizer.LastError
}
return tokenizer.ParseTree, nil
}
// ParseNext parses a single SQL statement from the tokenizer
// returning a Statement which is the AST representation of the query.
// The tokenizer will always read up to the end of the statement, allowing for
// the next call to ParseNext to parse any subsequent SQL statements. When
// there are no more statements to parse, a error of io.EOF is returned.
func ParseNext(tokenizer *Tokenizer) (Statement, error) {
if tokenizer.lastChar == ';' {
tokenizer.next()
tokenizer.skipBlank()
}
if tokenizer.lastChar == eofChar {
return nil, io.EOF
}
tokenizer.reset()
tokenizer.multi = true
if yyParse(tokenizer) != 0 {
if tokenizer.partialDDL != nil {
tokenizer.ParseTree = tokenizer.partialDDL
return tokenizer.ParseTree, nil
}
return nil, tokenizer.LastError
}
return tokenizer.ParseTree, nil
}
// SplitStatement returns the first sql statement up to either a ; or EOF
// and the remainder from the given buffer
func SplitStatement(blob string) (string, string, error) {
tokenizer := NewStringTokenizer(blob)
tkn := 0
for {
tkn, _ = tokenizer.Scan()
if tkn == 0 || tkn == ';' || tkn == eofChar {
break
}
}
if tokenizer.LastError != nil {
return "", "", tokenizer.LastError
}
if tkn == ';' {
return blob[:tokenizer.Position-2], blob[tokenizer.Position-1:], nil
}
return blob, "", nil
}
// SQLNode defines the interface for all nodes
// generated by the parser.
type SQLNode interface {
Format(buf *TrackedBuffer)
// WalkSubtree calls visit on all underlying nodes
// of the subtree, but not the current one. Walking
// must be interrupted if visit returns an error.
WalkSubtree(visit Visit) error
}
// Visit defines the signature of a function that
// can be used to visit all nodes of a parse tree.
type Visit func(node SQLNode) (kontinue bool, err error)
// Walk calls visit on every node.
// If visit returns true, the underlying nodes
// are also visited. If it returns an error, walking
// is interrupted, and the error is returned.
func Walk(visit Visit, nodes ...SQLNode) error {
for _, node := range nodes {
if node == nil {
continue
}
kontinue, err := visit(node)
if err != nil {
return err
}
if kontinue {
err = node.WalkSubtree(visit)
if err != nil {
return err
}
}
}
return nil
}
// String returns a string representation of an SQLNode.
func String(node SQLNode) string {
if node == nil {
return "<nil>"
}
buf := NewTrackedBuffer(nil)
buf.Myprintf("%v", node)
return buf.String()
}
// Append appends the SQLNode to the buffer.
func Append(buf *bytes.Buffer, node SQLNode) {
tbuf := &TrackedBuffer{
Buffer: buf,
}
node.Format(tbuf)
}
// Statement represents a statement.
type Statement interface {
iStatement()
SQLNode
}
func (*Union) iStatement() {}
func (*Select) iStatement() {}
func (*Insert) iStatement() {}
func (*Update) iStatement() {}
func (*Delete) iStatement() {}
func (*Set) iStatement() {}
func (*DDL) iStatement() {}
func (*Show) iStatement() {}
func (*Use) iStatement() {}
func (*OtherRead) iStatement() {}
func (*OtherAdmin) iStatement() {}
// ParenSelect can actually not be a top level statement,
// but we have to allow it because it's a requirement
// of SelectStatement.
func (*ParenSelect) iStatement() {}
// SelectStatement any SELECT statement.
type SelectStatement interface {
iSelectStatement()
iStatement()
iInsertRows()
AddOrder(*Order)
SetLimit(*Limit)
SQLNode
}
func (*Select) iSelectStatement() {}
func (*Union) iSelectStatement() {}
func (*ParenSelect) iSelectStatement() {}
// Select represents a SELECT statement.
type Select struct {
Cache string
Comments Comments
Distinct string
Hints string
SelectExprs SelectExprs
From TableExprs
Where *Where
GroupBy GroupBy
Having *Where
OrderBy OrderBy
Limit *Limit
Lock string
}
// Select.Distinct
const (
DistinctStr = "distinct "
StraightJoinHint = "straight_join "
)
// Select.Lock
const (
ForUpdateStr = " for update"
ShareModeStr = " lock in share mode"
)
// Select.Cache
const (
SQLCacheStr = "sql_cache "
SQLNoCacheStr = "sql_no_cache "
)
// AddOrder adds an order by element
func (node *Select) AddOrder(order *Order) {
node.OrderBy = append(node.OrderBy, order)
}
// SetLimit sets the limit clause
func (node *Select) SetLimit(limit *Limit) {
node.Limit = limit
}
// Format formats the node.
func (node *Select) Format(buf *TrackedBuffer) {
buf.Myprintf("select %v%s%s%s%v from %v%v%v%v%v%v%s",
node.Comments, node.Cache, node.Distinct, node.Hints, node.SelectExprs,
node.From, node.Where,
node.GroupBy, node.Having, node.OrderBy,
node.Limit, node.Lock)
}
// WalkSubtree walks the nodes of the subtree.
func (node *Select) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
return Walk(
visit,
node.Comments,
node.SelectExprs,
node.From,
node.Where,
node.GroupBy,
node.Having,
node.OrderBy,
node.Limit,
)
}
// AddWhere adds the boolean expression to the
// WHERE clause as an AND condition. If the expression
// is an OR clause, it parenthesizes it. Currently,
// the OR operator is the only one that's lower precedence
// than AND.
func (node *Select) AddWhere(expr Expr) {
if _, ok := expr.(*OrExpr); ok {
expr = &ParenExpr{Expr: expr}
}
if node.Where == nil {
node.Where = &Where{
Type: WhereStr,
Expr: expr,
}
return
}
node.Where.Expr = &AndExpr{
Left: node.Where.Expr,
Right: expr,
}
return
}
// AddHaving adds the boolean expression to the
// HAVING clause as an AND condition. If the expression
// is an OR clause, it parenthesizes it. Currently,
// the OR operator is the only one that's lower precedence
// than AND.
func (node *Select) AddHaving(expr Expr) {
if _, ok := expr.(*OrExpr); ok {
expr = &ParenExpr{Expr: expr}
}
if node.Having == nil {
node.Having = &Where{
Type: HavingStr,
Expr: expr,
}
return
}
node.Having.Expr = &AndExpr{
Left: node.Having.Expr,
Right: expr,
}
return
}
// ParenSelect is a parenthesized SELECT statement.
type ParenSelect struct {
Select SelectStatement
}
// AddOrder adds an order by element
func (node *ParenSelect) AddOrder(order *Order) {
panic("unreachable")
}
// SetLimit sets the limit clause
func (node *ParenSelect) SetLimit(limit *Limit) {
panic("unreachable")
}
// Format formats the node.
func (node *ParenSelect) Format(buf *TrackedBuffer) {
buf.Myprintf("(%v)", node.Select)
}
// WalkSubtree walks the nodes of the subtree.
func (node *ParenSelect) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
return Walk(
visit,
node.Select,
)
}
// Union represents a UNION statement.
type Union struct {
Type string
Left, Right SelectStatement
OrderBy OrderBy
Limit *Limit
Lock string
}
// Union.Type
const (
UnionStr = "union"
UnionAllStr = "union all"
UnionDistinctStr = "union distinct"
)
// AddOrder adds an order by element
func (node *Union) AddOrder(order *Order) {
node.OrderBy = append(node.OrderBy, order)
}
// SetLimit sets the limit clause
func (node *Union) SetLimit(limit *Limit) {
node.Limit = limit
}
// Format formats the node.
func (node *Union) Format(buf *TrackedBuffer) {
buf.Myprintf("%v %s %v%v%v%s", node.Left, node.Type, node.Right,
node.OrderBy, node.Limit, node.Lock)
}
// WalkSubtree walks the nodes of the subtree.
func (node *Union) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
return Walk(
visit,
node.Left,
node.Right,
)
}
// Insert represents an INSERT or REPLACE statement.
// Per the MySQL docs, http://dev.mysql.com/doc/refman/5.7/en/replace.html
// Replace is the counterpart to `INSERT IGNORE`, and works exactly like a
// normal INSERT except if the row exists. In that case it first deletes
// the row and re-inserts with new values. For that reason we keep it as an Insert struct.
// Replaces are currently disallowed in sharded schemas because
// of the implications the deletion part may have on vindexes.
// If you add fields here, consider adding them to calls to validateSubquerySamePlan.
type Insert struct {
Action string
Comments Comments
Ignore string
Table TableName
Columns Columns
Rows InsertRows
OnDup OnDup
}
// DDL strings.
const (
InsertStr = "insert"
ReplaceStr = "replace"
)
// Format formats the node.
func (node *Insert) Format(buf *TrackedBuffer) {
buf.Myprintf("%s %v%sinto %v%v %v%v",
node.Action,
node.Comments, node.Ignore,
node.Table, node.Columns, node.Rows, node.OnDup)
}
// WalkSubtree walks the nodes of the subtree.
func (node *Insert) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
return Walk(
visit,
node.Comments,
node.Table,
node.Columns,
node.Rows,
node.OnDup,
)
}
// InsertRows represents the rows for an INSERT statement.
type InsertRows interface {
iInsertRows()
SQLNode
}
func (*Select) iInsertRows() {}
func (*Union) iInsertRows() {}
func (Values) iInsertRows() {}
func (*ParenSelect) iInsertRows() {}
// Update represents an UPDATE statement.
// If you add fields here, consider adding them to calls to validateSubquerySamePlan.
type Update struct {
Comments Comments
TableExprs TableExprs
Exprs UpdateExprs
Where *Where
OrderBy OrderBy
Limit *Limit
}
// Format formats the node.
func (node *Update) Format(buf *TrackedBuffer) {
buf.Myprintf("update %v%v set %v%v%v%v",
node.Comments, node.TableExprs,
node.Exprs, node.Where, node.OrderBy, node.Limit)
}
// WalkSubtree walks the nodes of the subtree.
func (node *Update) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
return Walk(
visit,
node.Comments,
node.TableExprs,
node.Exprs,
node.Where,
node.OrderBy,
node.Limit,
)
}
// Delete represents a DELETE statement.
// If you add fields here, consider adding them to calls to validateSubquerySamePlan.
type Delete struct {
Comments Comments
Targets TableNames
TableExprs TableExprs
Where *Where
OrderBy OrderBy
Limit *Limit
}
// Format formats the node.
func (node *Delete) Format(buf *TrackedBuffer) {
buf.Myprintf("delete %v", node.Comments)
if node.Targets != nil {
buf.Myprintf("%v ", node.Targets)
}
buf.Myprintf("from %v%v%v%v", node.TableExprs, node.Where, node.OrderBy, node.Limit)
}
// WalkSubtree walks the nodes of the subtree.
func (node *Delete) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
return Walk(
visit,
node.Comments,
node.Targets,
node.TableExprs,
node.Where,
node.OrderBy,
node.Limit,
)
}
// Set represents a SET statement.
type Set struct {
Comments Comments
Exprs UpdateExprs
Charset ColIdent
}
// Format formats the node.
func (node *Set) Format(buf *TrackedBuffer) {
buf.Myprintf("set %v%v", node.Comments, node.Exprs)
}
// WalkSubtree walks the nodes of the subtree.
func (node *Set) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
return Walk(
visit,
node.Comments,
node.Exprs,
)
}
// DDL represents a CREATE, ALTER, DROP, RENAME or TRUNCATE statement.
// Table is set for AlterStr, DropStr, RenameStr, TruncateStr
// NewName is set for AlterStr, CreateStr, RenameStr.
type DDL struct {
Action string
Table TableName
NewName TableName
IfExists bool
TableSpec *TableSpec
PartitionSpec *PartitionSpec
}
// DDL strings.
const (
CreateStr = "create"
AlterStr = "alter"
DropStr = "drop"
RenameStr = "rename"
TruncateStr = "truncate"
)
// Format formats the node.
func (node *DDL) Format(buf *TrackedBuffer) {
switch node.Action {
case CreateStr:
if node.TableSpec == nil {
buf.Myprintf("%s table %v", node.Action, node.NewName)
} else {
buf.Myprintf("%s table %v %v", node.Action, node.NewName, node.TableSpec)
}
case DropStr:
exists := ""
if node.IfExists {
exists = " if exists"
}
buf.Myprintf("%s table%s %v", node.Action, exists, node.Table)
case RenameStr:
buf.Myprintf("%s table %v %v", node.Action, node.Table, node.NewName)
case AlterStr:
if node.PartitionSpec != nil {
buf.Myprintf("%s table %v %v", node.Action, node.Table, node.PartitionSpec)
} else {
buf.Myprintf("%s table %v", node.Action, node.Table)
}
default:
buf.Myprintf("%s table %v", node.Action, node.Table)
}
}
// WalkSubtree walks the nodes of the subtree.
func (node *DDL) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
return Walk(
visit,
node.Table,
node.NewName,
)
}
// Partition strings
const (
ReorganizeStr = "reorganize partition"
)
// PartitionSpec describe partition actions (for alter and create)
type PartitionSpec struct {
Action string
Name ColIdent
Definitions []*PartitionDefinition
}
// Format formats the node.
func (node *PartitionSpec) Format(buf *TrackedBuffer) {
switch node.Action {
case ReorganizeStr:
buf.Myprintf("%s %v into (", node.Action, node.Name)
var prefix string
for _, pd := range node.Definitions {
buf.Myprintf("%s%v", prefix, pd)
prefix = ", "
}
buf.Myprintf(")")
default:
panic("unimplemented")
}
}
// WalkSubtree walks the nodes of the subtree.
func (node *PartitionSpec) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
if err := Walk(visit, node.Name); err != nil {
return err
}
for _, def := range node.Definitions {
if err := Walk(visit, def); err != nil {
return err
}
}
return nil
}
// PartitionDefinition describes a very minimal partition definition
type PartitionDefinition struct {
Name ColIdent
Limit Expr
Maxvalue bool
}
// Format formats the node
func (node *PartitionDefinition) Format(buf *TrackedBuffer) {
if !node.Maxvalue {
buf.Myprintf("partition %v values less than (%v)", node.Name, node.Limit)
} else {
buf.Myprintf("partition %v values less than (maxvalue)", node.Name)
}
}
// WalkSubtree walks the nodes of the subtree.
func (node *PartitionDefinition) WalkSubtree(visit Visit) error {
if node == nil {
return nil
}
return Walk(
visit,
node.Name,
node.Limit,
)
}
// TableSpec describes the structure of a table from a CREATE TABLE statement
type TableSpec struct {
Columns []*ColumnDefinition
Indexes []*IndexDefinition
Options string
}
// Format formats the node.
func (ts *TableSpec) Format(buf *TrackedBuffer) {
buf.Myprintf("(\n")
for i, col := range ts.Columns {
if i == 0 {
buf.Myprintf("\t%v", col)
} else {
buf.Myprintf(",\n\t%v", col)
}
}
for _, idx := range ts.Indexes {
buf.Myprintf(",\n\t%v", idx)
}
buf.Myprintf("\n)%s", strings.Replace(ts.Options, ", ", ",\n ", -1))
}
// AddColumn appends the given column to the list in the spec
func (ts *TableSpec) AddColumn(cd *ColumnDefinition) {
ts.Columns = append(ts.Columns, cd)
}
// AddIndex appends the given index to the list in the spec
func (ts *TableSpec) AddIndex(id *IndexDefinition) {
ts.Indexes = append(ts.Indexes, id)
}
// WalkSubtree walks the nodes of the subtree.
func (ts *TableSpec) WalkSubtree(visit Visit) error {
if ts == nil {
return nil
}
for _, n := range ts.Columns {
if err := Walk(visit, n); err != nil {
return err
}
}
for _, n := range ts.Indexes {
if err := Walk(visit, n); err != nil {
return err
}
}
return nil
}
// ColumnDefinition describes a column in a CREATE TABLE statement
type ColumnDefinition struct {
Name ColIdent
Type ColumnType
}
// Format formats the node.
func (col *ColumnDefinition) Format(buf *TrackedBuffer) {
buf.Myprintf("%v %v", col.Name, &col.Type)
}
// WalkSubtree walks the nodes of the subtree.
func (col *ColumnDefinition) WalkSubtree(visit Visit) error {
if col == nil {
return nil
}
return Walk(
visit,
col.Name,
&col.Type,
)
}
// ColumnType represents a sql type in a CREATE TABLE statement
// All optional fields are nil if not specified
type ColumnType struct {
// The base type string
Type string
// Generic field options.
NotNull BoolVal
Autoincrement BoolVal
Default *SQLVal
OnUpdate *SQLVal
Comment *SQLVal
// Numeric field options
Length *SQLVal
Unsigned BoolVal
Zerofill BoolVal
Scale *SQLVal
// Text field options
Charset string
Collate string
// Enum values
EnumValues []string
// Key specification
KeyOpt ColumnKeyOption
}
// Format returns a canonical string representation of the type and all relevant options
func (ct *ColumnType) Format(buf *TrackedBuffer) {
buf.Myprintf("%s", ct.Type)
if ct.Length != nil && ct.Scale != nil {
buf.Myprintf("(%v,%v)", ct.Length, ct.Scale)
} else if ct.Length != nil {
buf.Myprintf("(%v)", ct.Length)
}
if ct.EnumValues != nil {
buf.Myprintf("(%s)", strings.Join(ct.EnumValues, ", "))
}
opts := make([]string, 0, 16)
if ct.Unsigned {
opts = append(opts, keywordStrings[UNSIGNED])
}
if ct.Zerofill {
opts = append(opts, keywordStrings[ZEROFILL])
}
if ct.Charset != "" {
opts = append(opts, keywordStrings[CHARACTER], keywordStrings[SET], ct.Charset)
}
if ct.Collate != "" {
opts = append(opts, keywordStrings[COLLATE], ct.Collate)
}
if ct.NotNull {
opts = append(opts, keywordStrings[NOT], keywordStrings[NULL])
}
if ct.Default != nil {
opts = append(opts, keywordStrings[DEFAULT], String(ct.Default))
}
if ct.OnUpdate != nil {
opts = append(opts, keywordStrings[ON], keywordStrings[UPDATE], String(ct.OnUpdate))
}
if ct.Autoincrement {
opts = append(opts, keywordStrings[AUTO_INCREMENT])
}
if ct.Comment != nil {
opts = append(opts, keywordStrings[COMMENT_KEYWORD], String(ct.Comment))
}
if ct.KeyOpt == colKeyPrimary {
opts = append(opts, keywordStrings[PRIMARY], keywordStrings[KEY])
}
if ct.KeyOpt == colKeyUnique {
opts = append(opts, keywordStrings[UNIQUE])
}
if ct.KeyOpt == colKeyUniqueKey {
opts = append(opts, keywordStrings[UNIQUE], keywordStrings[KEY])
}
if ct.KeyOpt == colKey {
opts = append(opts, keywordStrings[KEY])
}
if len(opts) != 0 {
buf.Myprintf(" %s", strings.Join(opts, " "))
}
}
// DescribeType returns the abbreviated type information as required for
// describe table
func (ct *ColumnType) DescribeType() string {
buf := NewTrackedBuffer(nil)
buf.Myprintf("%s", ct.Type)
if ct.Length != nil && ct.Scale != nil {
buf.Myprintf("(%v,%v)", ct.Length, ct.Scale)
} else if ct.Length != nil {
buf.Myprintf("(%v)", ct.Length)
}
opts := make([]string, 0, 16)
if ct.Unsigned {
opts = append(opts, keywordStrings[UNSIGNED])
}
if ct.Zerofill {
opts = append(opts, keywordStrings[ZEROFILL])
}
if len(opts) != 0 {
buf.Myprintf(" %s", strings.Join(opts, " "))
}
return buf.String()
}
// SQLType returns the sqltypes type code for the given column
func (ct *ColumnType) SQLType() querypb.Type {
switch ct.Type {
case keywordStrings[TINYINT]:
if ct.Unsigned {
return sqltypes.Uint8
}
return sqltypes.Int8
case keywordStrings[SMALLINT]:
if ct.Unsigned {
return sqltypes.Uint16
}
return sqltypes.Int16
case keywordStrings[MEDIUMINT]:
if ct.Unsigned {
return sqltypes.Uint24
}
return sqltypes.Int24
case keywordStrings[INT]:
fallthrough
case keywordStrings[INTEGER]:
if ct.Unsigned {
return sqltypes.Uint32
}
return sqltypes.Int32
case keywordStrings[BIGINT]:
if ct.Unsigned {
return sqltypes.Uint64
}
return sqltypes.Int64
case keywordStrings[TEXT]:
return sqltypes.Text
case keywordStrings[TINYTEXT]:
return sqltypes.Text
case keywordStrings[MEDIUMTEXT]:
return sqltypes.Text
case keywordStrings[LONGTEXT]:
return sqltypes.Text
case keywordStrings[BLOB]:
return sqltypes.Blob
case keywordStrings[TINYBLOB]:
return sqltypes.Blob
case keywordStrings[MEDIUMBLOB]:
return sqltypes.Blob
case keywordStrings[LONGBLOB]:
return sqltypes.Blob
case keywordStrings[CHAR]:
return sqltypes.Char
case keywordStrings[VARCHAR]:
return sqltypes.VarChar
case keywordStrings[BINARY]:
return sqltypes.Binary
case keywordStrings[VARBINARY]:
return sqltypes.VarBinary
case keywordStrings[DATE]:
return sqltypes.Date
case keywordStrings[TIME]:
return sqltypes.Time
case keywordStrings[DATETIME]:
return sqltypes.Datetime
case keywordStrings[TIMESTAMP]:
return sqltypes.Timestamp
case keywordStrings[YEAR]:
return sqltypes.Year
case keywordStrings[FLOAT_TYPE]:
return sqltypes.Float32
case keywordStrings[DOUBLE]:
return sqltypes.Float64
case keywordStrings[DECIMAL]:
return sqltypes.Decimal
case keywordStrings[BIT]:
return sqltypes.Bit
case keywordStrings[ENUM]:
return sqltypes.Enum
case keywordStrings[JSON]:
return sqltypes.TypeJSON
}
panic("unimplemented type " + ct.Type)
}
// WalkSubtree walks the nodes of the subtree.
func (ct *ColumnType) WalkSubtree(visit Visit) error {
return nil
}
// IndexDefinition describes an index in a CREATE TABLE statement
type IndexDefinition struct {
Info *IndexInfo
Columns []*IndexColumn
}
// Format formats the node.
func (idx *IndexDefinition) Format(buf *TrackedBuffer) {
buf.Myprintf("%v (", idx.Info)
for i, col := range idx.Columns {
if i != 0 {
buf.Myprintf(", %v", col.Column)
} else {
buf.Myprintf("%v", col.Column)
}
if col.Length != nil {
buf.Myprintf("(%v)", col.Length)
}
}
buf.Myprintf(")")
}
// WalkSubtree walks the nodes of the subtree.
func (idx *IndexDefinition) WalkSubtree(visit Visit) error {
if idx == nil {
return nil
}
for _, n := range idx.Columns {
if err := Walk(visit, n.Column); err != nil {
return err
}
}
return nil
}
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