[fix](like_func) incorrect result of like with 'NO_BACKSLASH_ESCAPES' mode (#27842)

be/src/vec/functions/like.cpp

@@ -453,24 +453,30 @@ void FunctionLike::convert_like_pattern(LikeSearchState* state, const std::strin
 
     bool is_escaped = false;
     for (size_t i = 0; i < pattern.size(); ++i) {
-        if (!is_escaped && pattern[i] == '%') {
-            re_pattern->append(".*");
-        } else if (!is_escaped && pattern[i] == '_') {
-            re_pattern->append(".");
-            // check for escape char before checking for regex special chars, they might overlap
-        } else if (!is_escaped && pattern[i] == state->escape_char) {
-            is_escaped = true;
-        } else if (pattern[i] == '.' || pattern[i] == '[' || pattern[i] == ']' ||
-                   pattern[i] == '{' || pattern[i] == '}' || pattern[i] == '(' ||
-                   pattern[i] == ')' || pattern[i] == '\\' || pattern[i] == '*' ||
-                   pattern[i] == '+' || pattern[i] == '?' || pattern[i] == '|' ||
-                   pattern[i] == '^' || pattern[i] == '$') {
-            // escape all regex special characters; see list at
-            re_pattern->append("\\");
-            re_pattern->append(1, pattern[i]);
-            is_escaped = false;
+        if (!is_escaped) {
+            switch (pattern[i]) {
+            case '%':
+                re_pattern->append(".*");
+                break;
+            case '_':
+                re_pattern->append(".");
+                break;
+            default:
+                is_escaped = pattern[i] == state->escape_char;
+                if (!is_escaped) {
+                    re_pattern->append(1, pattern[i]);
+                }
+                break;
+            }
         } else {
-            // regular character or escaped special character
+            if (pattern[i] == '.' || pattern[i] == '[' || pattern[i] == ']' || pattern[i] == '{' ||
+                pattern[i] == '}' || pattern[i] == '(' || pattern[i] == ')' || pattern[i] == '\\' ||
+                pattern[i] == '*' || pattern[i] == '+' || pattern[i] == '?' || pattern[i] == '|' ||
+                pattern[i] == '^' || pattern[i] == '$') {
+                re_pattern->append("\\");
+            } else if (pattern[i] != '%' && pattern[i] != '_') {
+                re_pattern->append("\\\\");
+            }
             re_pattern->append(1, pattern[i]);
             is_escaped = false;
         }
@@ -634,7 +640,8 @@ Status FunctionLike::open(FunctionContext* context, FunctionContext::FunctionSta
                 opts.set_dot_nl(true);
                 state->search_state.regex = std::make_unique<RE2>(re_pattern, opts);
                 if (!state->search_state.regex->ok()) {
-                    return Status::InternalError("Invalid regex expression: {}", pattern_str);
+                    return Status::InternalError("Invalid regex expression: {}(origin: {})",
+                                                 re_pattern, pattern_str);
                 }
             }
 

regression-test/data/query_p0/sql_functions/string_functions/test_like_no_backslash_escapes_mode.out

@@ -0,0 +1,7 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !select1 --
+1	TIN\\PEXNB601C6UUTAB
+
+-- !select2 --
+1	TIN\\PEXNB601C6UUTAB
+

regression-test/suites/query_p0/sql_functions/string_functions/test_like_no_backslash_escapes_mode.groovy

@@ -0,0 +1,50 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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.
+
+suite("test_like_no_backslash_escapes_mode") {
+
+    sql """ set sql_mode = "NO_BACKSLASH_ESCAPES";  """
+    def tbName = "test_like_no_backslash_escapes_mode_tbl"
+    sql "DROP TABLE IF EXISTS ${tbName}"
+
+    sql """
+        CREATE TABLE `${tbName}` (
+          `id` INT NULL,
+          `value` VARCHAR(100) NULL
+        ) ENGINE=OLAP
+        DUPLICATE KEY(`id`)
+        COMMENT 'OLAP'
+        DISTRIBUTED BY HASH(`id`) BUCKETS 1
+        PROPERTIES (
+        "replication_allocation" = "tag.location.default: 1"
+        );
+    """
+
+    sql """
+        INSERT INTO ${tbName} VALUES (1, "TIN\\PEXNB601C6UUTAB");
+    """
+
+    qt_select1 """
+        select * from ${tbName} where `value` like "%TIN\\PE%";
+    """
+
+    qt_select2 """
+        select * from ${tbName} where `value` = "TIN\\PEXNB601C6UUTAB";
+    """
+
+    // sql "DROP TABLE ${tbName};"
+}