fix issue #208

  https://github.com/XiaoMi/soar/issues/208

ast/testdata/TestSplitStatement.golden

@@ -39,6 +39,7 @@ tb;
 19 INSERT /*+ SET_VAR(foreign_key_checks=OFF) */ INTO t2 VALUES(2);
 20 select /*!50000 1,*/ 1;
 21 UPDATE xxx SET c1=' LOGGER.error(""); }' WHERE id = 2 ;
+22 UPDATE `xxx` SET aaa='a;' WHERE `id` = 15;
 0 select * from test\G
 1 select 'hello\Gworld', col from test\G
 2 -- select * from test\Ghello

ast/token.go

@@ -933,7 +933,7 @@ func SplitStatement(buf []byte, delimiter []byte) (string, string, []byte) {
 			if i > 1 && buf[i-1] != '\\' {
 				if quoted && b == quoteRune {
 					quoted = false
-					quoteRune = '0'
+					quoteRune = 0
 				} else {
 					// check if first time found quote
 					if quoteRune == 0 {

ast/token_test.go

@@ -171,6 +171,7 @@ select col from tb;
 		[]byte(`INSERT /*+ SET_VAR(foreign_key_checks=OFF) */ INTO t2 VALUES(2);`), // 19
 		[]byte(`select /*!50000 1,*/ 1;`),                                          // 20
 		[]byte(`UPDATE xxx SET c1=' LOGGER.error(""); }' WHERE id = 2 ;`),          // 21
+		[]byte("UPDATE `xxx` SET aaa='a;' WHERE `id` = 15;"),                       // 22
 	}
 	// \G 分隔符
 	buf2s := [][]byte{
@@ -184,6 +185,9 @@ select col from tb;
         \\G*/
         from test\\Ghello`), // 6
 	}
+	// single sql test
+	// SplitStatement(bufs[22], []byte(";"))
+	// return
 	err := common.GoldenDiff(func() {
 		for i, buf := range bufs {
 			sql, _, _ := SplitStatement(buf, []byte(";"))