76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
// Copyright 2025 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 (
|
|
"github.com/pingcap/tidb/pkg/parser/ast"
|
|
)
|
|
|
|
// FTSInfo is an easy to use struct for interpreting a FullTextSearch expression.
|
|
type FTSInfo struct {
|
|
Query string
|
|
Column *Column
|
|
}
|
|
|
|
// ContainsFullTextSearchFn recursively checks whether the expression tree contains a
|
|
// possible FullTextSearch function.
|
|
func ContainsFullTextSearchFn(expr Expression) bool {
|
|
switch x := expr.(type) {
|
|
case *ScalarFunction:
|
|
if x.FuncName.L == ast.FTSMatchWord {
|
|
return true
|
|
}
|
|
for _, arg := range x.GetArgs() {
|
|
if ContainsFullTextSearchFn(arg) {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// InterpretFullTextSearchExpr try to interpret a FullText search expression.
|
|
// If interpret successfully, return a FTSInfo struct, otherwise return nil.
|
|
func InterpretFullTextSearchExpr(expr Expression) *FTSInfo {
|
|
x, ok := expr.(*ScalarFunction)
|
|
if !ok {
|
|
return nil
|
|
}
|
|
|
|
if x.FuncName.L != ast.FTSMatchWord {
|
|
return nil
|
|
}
|
|
|
|
if len(x.GetArgs()) != 2 {
|
|
return nil
|
|
}
|
|
argQuery := x.GetArgs()[0]
|
|
argColumn := x.GetArgs()[1]
|
|
|
|
query, ok := argQuery.(*Constant)
|
|
if !ok {
|
|
return nil
|
|
}
|
|
column, ok := argColumn.(*Column)
|
|
if !ok {
|
|
return nil
|
|
}
|
|
|
|
return &FTSInfo{
|
|
Query: query.Value.GetString(),
|
|
Column: column,
|
|
}
|
|
}
|