tidb simple_record_set 源码
tidb simple_record_set 代码
文件路径：/util/sqlexec/simple_record_set.go
// Copyright 2022 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 sqlexec
import (
"context"
"github.com/pingcap/tidb/parser/ast"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/chunk"
)
// SimpleRecordSet is a simple implementation of RecordSet. All values are known when creating SimpleRecordSet.
type SimpleRecordSet struct {
ResultFields []*ast.ResultField
Rows [][]interface{}
MaxChunkSize int
idx int
}
// Fields implements the sqlexec.RecordSet interface.
func (r *SimpleRecordSet) Fields() []*ast.ResultField {
return r.ResultFields
}
// Next implements the sqlexec.RecordSet interface.
func (r *SimpleRecordSet) Next(_ context.Context, req *chunk.Chunk) error {
req.Reset()
for r.idx < len(r.Rows) {
if req.IsFull() {
return nil
}
for i := range r.ResultFields {
datum := types.NewDatum(r.Rows[r.idx][i])
req.AppendDatum(i, &datum)
}
r.idx++
}
return nil
}
// NewChunk implements the sqlexec.RecordSet interface.
func (r *SimpleRecordSet) NewChunk(alloc chunk.Allocator) *chunk.Chunk {
fields := make([]*types.FieldType, 0, len(r.ResultFields))
for _, field := range r.ResultFields {
fields = append(fields, &field.Column.FieldType)
}
if alloc != nil {
return alloc.Alloc(fields, 0, r.MaxChunkSize)
}
return chunk.New(fields, r.MaxChunkSize, r.MaxChunkSize)
}
// Close implements the sqlexec.RecordSet interface.
func (r *SimpleRecordSet) Close() error {
r.idx = 0
return nil
}
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