b6a95a8cb3
* 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
145 lines
3.1 KiB
Go
145 lines
3.1 KiB
Go
// Copyright 2016 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 executor
|
|
|
|
import (
|
|
"github.com/juju/errors"
|
|
"github.com/pingcap/tidb/ast"
|
|
"github.com/pingcap/tidb/context"
|
|
"github.com/pingcap/tidb/infoschema"
|
|
"github.com/pingcap/tidb/optimizer/plan"
|
|
"github.com/pingcap/tidb/util/types"
|
|
)
|
|
|
|
var _ ast.SubqueryExec = &subquery{}
|
|
|
|
// subquery is an exprNode with a plan.
|
|
type subquery struct {
|
|
types.Datum
|
|
Type *types.FieldType
|
|
flag uint64
|
|
text string
|
|
plan plan.Plan
|
|
is infoschema.InfoSchema
|
|
}
|
|
|
|
// SetDatum implements Expression interface.
|
|
func (sq *subquery) SetDatum(datum types.Datum) {
|
|
sq.Datum = datum
|
|
}
|
|
|
|
// GetDatum implements Expression interface.
|
|
func (sq *subquery) GetDatum() *types.Datum {
|
|
return &sq.Datum
|
|
}
|
|
|
|
// SetFlag implements Expression interface.
|
|
func (sq *subquery) SetFlag(flag uint64) {
|
|
sq.flag = flag
|
|
}
|
|
|
|
// GetFlag implements Expression interface.
|
|
func (sq *subquery) GetFlag() uint64 {
|
|
return sq.flag
|
|
}
|
|
|
|
// SetText implements Node interface.
|
|
func (sq *subquery) SetText(text string) {
|
|
sq.text = text
|
|
}
|
|
|
|
// Text implements Node interface.
|
|
func (sq *subquery) Text() string {
|
|
return sq.text
|
|
}
|
|
|
|
// SetType implements Expression interface.
|
|
func (sq *subquery) SetType(tp *types.FieldType) {
|
|
sq.Type = tp
|
|
}
|
|
|
|
// GetType implements Expression interface.
|
|
func (sq *subquery) GetType() *types.FieldType {
|
|
return sq.Type
|
|
}
|
|
|
|
func (sq *subquery) Accept(v ast.Visitor) (ast.Node, bool) {
|
|
// SubQuery is not a normal ExprNode.
|
|
newNode, skipChildren := v.Enter(sq)
|
|
if skipChildren {
|
|
return v.Leave(newNode)
|
|
}
|
|
sq = newNode.(*subquery)
|
|
return v.Leave(sq)
|
|
}
|
|
|
|
func (sq *subquery) EvalRows(ctx context.Context, rowCount int) ([]interface{}, error) {
|
|
b := newExecutorBuilder(ctx, sq.is)
|
|
plan.Refine(sq.plan)
|
|
e := b.build(sq.plan)
|
|
if b.err != nil {
|
|
return nil, errors.Trace(b.err)
|
|
}
|
|
defer e.Close()
|
|
if len(e.Fields()) == 0 {
|
|
// No result fields means no Recordset.
|
|
for {
|
|
row, err := e.Next()
|
|
if err != nil {
|
|
return nil, errors.Trace(err)
|
|
}
|
|
if row == nil {
|
|
return nil, nil
|
|
}
|
|
}
|
|
}
|
|
var (
|
|
err error
|
|
row *Row
|
|
rows = []interface{}{}
|
|
)
|
|
for rowCount != 0 {
|
|
row, err = e.Next()
|
|
if err != nil {
|
|
return rows, errors.Trace(err)
|
|
}
|
|
if row == nil {
|
|
break
|
|
}
|
|
if len(row.Data) == 1 {
|
|
rows = append(rows, row.Data[0].GetValue())
|
|
} else {
|
|
rows = append(rows, types.DatumsToInterfaces(row.Data))
|
|
}
|
|
if rowCount > 0 {
|
|
rowCount--
|
|
}
|
|
}
|
|
return rows, nil
|
|
}
|
|
|
|
func (sq *subquery) ColumnCount() (int, error) {
|
|
return len(sq.plan.Fields()), nil
|
|
}
|
|
|
|
type subqueryBuilder struct {
|
|
is infoschema.InfoSchema
|
|
}
|
|
|
|
func (sb *subqueryBuilder) Build(p plan.Plan) ast.SubqueryExec {
|
|
return &subquery{
|
|
is: sb.is,
|
|
plan: p,
|
|
}
|
|
}
|