[fix](like_func) incorrect result of like with 'NO_BACKSLASH_ESCAPES'…

… mode(apache#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};"
+}