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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| // Copyright 2023 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 statistics | ||
|
|
||
| import ( | ||
| "time" | ||
|
|
||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/util/codec" | ||
| "github.com/pingcap/tidb/util/hack" | ||
| ) | ||
|
|
||
| // DatumMapCache is used to store the mapping from the string type to datum type. | ||
| // The datum is used to find the value in the histogram. | ||
| type DatumMapCache struct { | ||
| datumMap map[hack.MutableString]types.Datum | ||
| } | ||
|
|
||
| // NewDatumMapCache creates a new DatumMapCache. | ||
| func NewDatumMapCache() *DatumMapCache { | ||
| return &DatumMapCache{ | ||
| datumMap: make(map[hack.MutableString]types.Datum), | ||
| } | ||
| } | ||
|
|
||
| // Get gets the datum from the cache. | ||
| func (d *DatumMapCache) Get(key hack.MutableString) (val types.Datum, ok bool) { | ||
| val, ok = d.datumMap[key] | ||
| return | ||
| } | ||
|
|
||
| // Put puts the datum into the cache. | ||
| func (d *DatumMapCache) Put(val TopNMeta, encodedVal hack.MutableString, | ||
| tp byte, isIndex bool, loc *time.Location) (dat types.Datum, err error) { | ||
| dat, err = topNMetaToDatum(val, tp, isIndex, loc) | ||
| if err != nil { | ||
| return dat, err | ||
| } | ||
| d.datumMap[encodedVal] = dat | ||
| return dat, nil | ||
| } | ||
|
|
||
| func topNMetaToDatum(val TopNMeta, | ||
| tp byte, isIndex bool, loc *time.Location) (dat types.Datum, err error) { | ||
| if isIndex { | ||
| dat.SetBytes(val.Encoded) | ||
| } else { | ||
| var err error | ||
| if types.IsTypeTime(tp) { | ||
| // Handle date time values specially since they are encoded to int and we'll get int values if using DecodeOne. | ||
| _, dat, err = codec.DecodeAsDateTime(val.Encoded, tp, loc) | ||
| } else if types.IsTypeFloat(tp) { | ||
| _, dat, err = codec.DecodeAsFloat32(val.Encoded, tp) | ||
| } else { | ||
| _, dat, err = codec.DecodeOne(val.Encoded) | ||
| } | ||
| if err != nil { | ||
| return dat, err | ||
| } | ||
| } | ||
| return dat, err | ||
| } |
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