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*: add builtin aggregate function
json_objectagg (pingcap#11154)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package aggfuncs | ||
|
|
||
| import ( | ||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/types/json" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| ) | ||
|
|
||
| type jsonObjectAgg struct { | ||
| baseAggFunc | ||
| } | ||
|
|
||
| type partialResult4JsonObjectAgg struct { | ||
| entries map[string]interface{} | ||
| } | ||
|
|
||
| func (e *jsonObjectAgg) AllocPartialResult() PartialResult { | ||
| p := partialResult4JsonObjectAgg{} | ||
| p.entries = make(map[string]interface{}) | ||
| return PartialResult(&p) | ||
| } | ||
|
|
||
| func (e *jsonObjectAgg) ResetPartialResult(pr PartialResult) { | ||
| p := (*partialResult4JsonObjectAgg)(pr) | ||
| p.entries = make(map[string]interface{}) | ||
| } | ||
|
|
||
| func (e *jsonObjectAgg) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error { | ||
| p := (*partialResult4JsonObjectAgg)(pr) | ||
| if len(p.entries) == 0 { | ||
| chk.AppendNull(e.ordinal) | ||
| return nil | ||
| } | ||
|
|
||
| // appendBinary does not support some type such as uint8、types.time，so convert is needed here | ||
| for key, val := range p.entries { | ||
| switch x := val.(type) { | ||
| case *types.MyDecimal: | ||
| float64Val, err := x.ToFloat64() | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| p.entries[key] = float64Val | ||
| case []uint8, types.Time, types.Duration: | ||
| strVal, err := types.ToString(x) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| p.entries[key] = strVal | ||
| } | ||
| } | ||
|
|
||
| chk.AppendJSON(e.ordinal, json.CreateBinary(p.entries)) | ||
| return nil | ||
| } | ||
|
|
||
| func (e *jsonObjectAgg) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4JsonObjectAgg)(pr) | ||
| for _, row := range rowsInGroup { | ||
| key, err := e.args[0].Eval(row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
|
|
||
| value, err := e.args[1].Eval(row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
|
|
||
| if key.IsNull() { | ||
| return json.ErrJSONDocumentNULLKey | ||
| } | ||
|
|
||
| // the result json's key is string, so it needs to convert the first arg to string | ||
| keyString, err := key.ToString() | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
|
|
||
| realVal := value.GetValue() | ||
| switch x := realVal.(type) { | ||
| case nil, bool, int64, uint64, float64, string, json.BinaryJSON, *types.MyDecimal, []uint8, types.Time, types.Duration: | ||
| p.entries[keyString] = realVal | ||
| default: | ||
| return json.ErrUnsupportedSecondArgumentType.GenWithStackByArgs(x) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (e *jsonObjectAgg) MergePartialResult(sctx sessionctx.Context, src PartialResult, dst PartialResult) error { | ||
| p1, p2 := (*partialResult4JsonObjectAgg)(src), (*partialResult4JsonObjectAgg)(dst) | ||
| // When the result of this function is normalized, values having duplicate keys are discarded, | ||
| // and only the last value encountered is used with that key in the returned object | ||
| for k, v := range p1.entries { | ||
| p2.entries[k] = v | ||
| } | ||
| return nil | ||
| } |
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