util, executor: fix infoschema like on table names with $ (#67961)

close #67727

Author: expxiaoli

pkg/executor/test/infoschema/infoschema_test.go

@@ -495,6 +495,9 @@ func TestTablesTable(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, 2, selectTables)
 	require.Equal(t, totalTables, remainTables+selectTables)
+
+	tk.MustExec("create table test.`$a$a` (a int)")
+	tk.MustQuery("select count(*) from information_schema.tables where table_name like '$a$%'").Check(testkit.Rows("1"))
 }
 
 func TestColumnTable(t *testing.T) {

pkg/util/stringutil/string_util.go

@@ -17,6 +17,7 @@ package stringutil
 import (
 	"bytes"
 	"fmt"
+	"regexp"
 	"slices"
 	"strings"
 	"unicode/utf8"
@@ -259,18 +260,21 @@ func matchRune(a, b rune) bool {
 // CompileLike2Regexp convert a like `lhs` to a regular expression
 func CompileLike2Regexp(str string) string {
 	patChars, patTypes := CompilePattern(str, '\\')
-	var result []rune
+	var result strings.Builder
+	result.Grow(len(patChars)*2 + 2)
+	result.WriteByte('^')
 	for i := range patChars {
 		switch patTypes[i] {
 		case PatMatch:
-			result = append(result, patChars[i])
+			result.WriteString(regexp.QuoteMeta(string(patChars[i])))
 		case PatOne:
-			result = append(result, '.')
+			result.WriteByte('.')
 		case PatAny:
-			result = append(result, '.', '*')
+			result.WriteString(".*")
 		}
 	}
-	return "^" + string(result) + "$"
+	result.WriteByte('$')
+	return result.String()
 }
 
 // DoMatchBinary is an adapter for `DoMatchInner`, `str` is binary strings or ascii string.

pkg/util/stringutil/string_util_test.go

@@ -116,6 +116,9 @@ func TestCompileLike2Regexp(t *testing.T) {
 		{``, `^$`},
 		{`a`, `^a$`},
 		{`aA`, `^aA$`},
+		{`$a$%`, `^\$a\$.*$`},
+		{`a.b%`, `^a\.b.*$`},
+		{`a+b`, `^a\+b$`},
 		{`_`, `^.$`},
 		{`__`, `^..$`},
 		{`%`, `^.*$`},
@@ -124,7 +127,7 @@ func TestCompileLike2Regexp(t *testing.T) {
 		{`a%`, `^a.*$`},
 		{`\%a`, `^%a$`},
 		{`\_a`, `^_a$`},
-		{`\\_a`, `^\.a$`},
+		{`\\_a`, `^\\.a$`},
 		{`\a\b`, `^ab$`},
 		{`%%_`, `^..*$`},
 		{`%_%_aA`, "^...*aA$"},