[TD-12252]<feature>(connector,query,insert,other,tools,taosAdapter):deal with escape character

src/util/src/tcompare.c

@@ -390,6 +390,7 @@ int WCSPatternMatch(const uint32_t *patterStr, const uint32_t *str, size_t size,
   uint32_t c, c1;
   uint32_t matchOne = (uint32_t) L'_';  // "_"
   uint32_t matchAll = (uint32_t) L'%';  // "%"
+  uint32_t escape   = (uint32_t) L'\\';  // "\"
 
   int32_t i = 0;
   int32_t j = 0;
@@ -427,6 +428,8 @@ int WCSPatternMatch(const uint32_t *patterStr, const uint32_t *str, size_t size,
     c1 = str[j++];
 
     if (j <= size) {
+      if (c == escape && patterStr[i] == matchOne && c1 == matchOne) { i++; continue; }
+      if (c == escape && patterStr[i] == matchAll && c1 == matchAll) { i++; continue; }
       if (c == c1 || towlower(c) == towlower(c1) || (c == matchOne && c1 != 0)) {
         continue;
       }

tests/develop-test/2-query/escape.py

@@ -24,6 +24,7 @@ class TDTestCase:
         case2: [TD-12334] '\' escape unknown
         case3: [TD-11071] escape table creation problem
         case4: [TD-6232]  fix abnormal escaping results about '\'
+        case5: [TD-12815] like wildcards (% _)  are not supported nchar type
         '''
         return
 
@@ -105,7 +106,13 @@ class TDTestCase:
         tdSql.query(r"select * from tt where i='9'")
         tdSql.checkRows(1)
 
-
+        # [TD-12815] like wildcard(%, _) are not supported nchar
+        tdSql.execute(r"insert into tt values(1591070708000, 'h%d')")
+        tdSql.execute(r"insert into tt values(1591080708000, 'h_j')")
+        tdSql.query(r"select * from tt where i like 'h\%d'")
+        tdSql.checkRows(1)
+        tdSql.query(r"select * from tt where i like 'h\_j'")
+        tdSql.checkRows(1)
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)