tidb func_json_arrayagg 源码
tidb func_json_arrayagg 代码
文件路径：/executor/aggfuncs/func_json_arrayagg.go
// Copyright 2020 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 aggfuncs
import (
"unsafe"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/chunk"
)
const (
// DefPartialResult4JsonArrayagg is the size of partialResult4JsonArrayagg
DefPartialResult4JsonArrayagg = int64(unsafe.Sizeof(partialResult4JsonArrayagg{}))
)
type jsonArrayagg struct {
baseAggFunc
}
type partialResult4JsonArrayagg struct {
entries []interface{}
}
func (e *jsonArrayagg) AllocPartialResult() (pr PartialResult, memDelta int64) {
p := partialResult4JsonArrayagg{}
p.entries = make([]interface{}, 0)
return PartialResult(&p), DefPartialResult4JsonArrayagg + DefSliceSize
}
func (e *jsonArrayagg) ResetPartialResult(pr PartialResult) {
p := (*partialResult4JsonArrayagg)(pr)
p.entries = p.entries[:0]
}
func (e *jsonArrayagg) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4JsonArrayagg)(pr)
if len(p.entries) == 0 {
chk.AppendNull(e.ordinal)
return nil
}
json, err := types.CreateBinaryJSONWithCheck(p.entries)
if err != nil {
return errors.Trace(err)
}
chk.AppendJSON(e.ordinal, json)
return nil
}
func (e *jsonArrayagg) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) (memDelta int64, err error) {
p := (*partialResult4JsonArrayagg)(pr)
for _, row := range rowsInGroup {
item, err := e.args[0].Eval(row)
if err != nil {
return 0, errors.Trace(err)
}
realItem, err := getRealJSONValue(item, e.args[0].GetType())
if err != nil {
return 0, errors.Trace(err)
}
switch x := realItem.(type) {
case nil, bool, int64, uint64, float64, string, types.BinaryJSON, types.Opaque, types.Time, types.Duration:
p.entries = append(p.entries, realItem)
memDelta += getValMemDelta(realItem)
default:
return 0, types.ErrUnsupportedSecondArgumentType.GenWithStackByArgs(x)
}
}
return memDelta, nil
}
func (e *jsonArrayagg) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) (memDelta int64, err error) {
p1, p2 := (*partialResult4JsonArrayagg)(src), (*partialResult4JsonArrayagg)(dst)
p2.entries = append(p2.entries, p1.entries...)
return 0, nil
}
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