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planner: support vector index in planner (#56204)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| // Copyright 2024 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 expression | ||
|
|
||
| import ( | ||
| "strings" | ||
|
|
||
| "github.com/pingcap/tidb/pkg/parser/ast" | ||
| "github.com/pingcap/tidb/pkg/parser/model" | ||
| "github.com/pingcap/tidb/pkg/parser/mysql" | ||
| "github.com/pingcap/tidb/pkg/types" | ||
| "github.com/pingcap/tidb/pkg/util/intest" | ||
| "github.com/pingcap/tipb/go-tipb" | ||
| ) | ||
|
|
||
| var ( | ||
| vsDistanceFnNamesLower = map[string]struct{}{ | ||
| strings.ToLower(ast.VecL1Distance): {}, | ||
| strings.ToLower(ast.VecL2Distance): {}, | ||
| strings.ToLower(ast.VecCosineDistance): {}, | ||
| strings.ToLower(ast.VecNegativeInnerProduct): {}, | ||
| } | ||
| ) | ||
|
|
||
| // VectorHelper is a helper struct for vector indexes. | ||
| type VectorHelper struct { | ||
| DistanceFnName model.CIStr | ||
| FnPbCode tipb.ScalarFuncSig | ||
| Vec types.VectorFloat32 | ||
| Column *Column | ||
| } | ||
|
|
||
| // ExtractVectorHelper extracts a VectorSearchExpr from an expression. | ||
| // NOTE: not all VectorSearch functions are supported by the index. The caller | ||
| // needs to check the distance function name. | ||
| func ExtractVectorHelper(expr Expression) *VectorHelper { | ||
| x, ok := expr.(*ScalarFunction) | ||
| if !ok { | ||
| return nil | ||
| } | ||
|
|
||
| if _, isVecFn := vsDistanceFnNamesLower[x.FuncName.L]; !isVecFn { | ||
| return nil | ||
| } | ||
|
|
||
| args := x.GetArgs() | ||
| // One arg must be a vector column ref, and one arg must be a vector constant. | ||
| var vectorConstant *Constant = nil | ||
| var vectorColumn *Column = nil | ||
| nVectorColumns := 0 | ||
| nVectorConstants := 0 | ||
| for _, arg := range args { | ||
| if v, ok := arg.(*Column); ok { | ||
| if v.RetType.GetType() != mysql.TypeTiDBVectorFloat32 { | ||
| return nil | ||
| } | ||
| vectorColumn = v | ||
| nVectorColumns++ | ||
| } else if v, ok := arg.(*Constant); ok { | ||
| if v.RetType.GetType() != mysql.TypeTiDBVectorFloat32 { | ||
| return nil | ||
| } | ||
| vectorConstant = v | ||
| nVectorConstants++ | ||
| } | ||
| } | ||
| if nVectorColumns != 1 || nVectorConstants != 1 { | ||
| return nil | ||
| } | ||
|
|
||
| intest.Assert(vectorConstant.Value.Kind() == types.KindVectorFloat32, "internal: expect vectorFloat32 constant, but got %s", vectorConstant.Value.String()) | ||
|
|
||
| return &VectorHelper{ | ||
| DistanceFnName: x.FuncName, | ||
| FnPbCode: x.Function.PbCode(), | ||
| Vec: vectorConstant.Value.GetVectorFloat32(), | ||
| Column: vectorColumn, | ||
| } | ||
| } |
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