[TD-5466]<fix> handle invalid Escapes

src/util/src/tutil.c

@@ -64,12 +64,15 @@ int32_t strRmquote(char *z, int32_t len){
     int32_t j = 0;
     for (uint32_t k = 1; k < len - 1; ++k) {
       if (z[k] == '\\' || (z[k] == delim && z[k + 1] == delim)) {
+        if (z[k] == '\\' && z[k + 1] == '_') {
+          //match '_' self
+        } else {
           z[j] = z[k + 1];
-  
-        cnt++;
-        j++;
-        k++;
-        continue;
+          cnt++;
+          j++;
+          k++;
+          continue;
+        }
       }
   
       z[j] = z[k];

tests/script/general/parser/like.sim

@@ -0,0 +1,61 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/cfg.sh -n dnode1 -c walLevel -v 1
+system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 4
+system sh/exec.sh -n dnode1 -s start
+
+sleep 10
+sql connect
+print ======================== dnode1 start
+
+
+$db = testdb
+sql drop database if exists $db
+sql create database $db cachelast 2
+sql use $db
+
+$table1 = table_name
+$table2 = tablexname
+
+sql create table $table1 (ts timestamp, b binary(20))
+sql create table $table2 (ts timestamp, b binary(20))
+
+sql insert into $table1 values(now,    "table_name")
+sql insert into $table1 values(now-1m, "tablexname")
+sql insert into $table1 values(now-2m, "tablexxx")
+sql insert into $table1 values(now-2m, "table")
+
+sql select b from $table1 
+if $rows != 4 then
+  return -1
+endi
+
+sql select b from $table1 where b like 'table_name' 
+if $rows != 2 then
+  return -1
+endi
+
+
+sql select b from $table1 where b like 'table\_name'
+if $rows != 1 then
+  return -1
+endi
+
+sql show tables;
+if $rows != 2 then 
+  return -1
+endi
+
+sql show tables like 'table_name'
+if $rows != 2 then 
+  return -1
+endi
+
+sql show tables like 'table\_name'
+if $rows != 1 then 
+  return -1
+endi
+
+system sh/exec.sh -n dnode1 -s stop -x SIGINT
+
+