fix(tianmu): When executing SELECT..WHERE NAME LIKE %_, it failed(sto…

…neatom#1157)

1. Handle the result set error caused by character transfer(stoneatom#1157)(stoneatom#1162)
2. Handle the result set problem caused by ESCAPE keyword(stoneatom#1162)

mysql-test/suite/tianmu/r/issue1157.result

@@ -0,0 +1,37 @@
+DROP DATABASE IF EXISTS issue1157_test;
+CREATE DATABASE issue1157_test;
+USE issue1157_test;
+CREATE TABLE st(
+`id` BIGINT(20) NOT NULL AUTO_INCREMENT,
+`name` VARCHAR(255) DEFAULT NULL,
+`uid` VARCHAR(11) DEFAULT NULL,
+PRIMARY KEY (`id`)
+)engine=tianmu;
+INSERT INTO st (NAME,uid) VALUES('%a','world');
+INSERT INTO st (NAME,uid) VALUES('%_','world');
+SELECT * FROM st WHERE NAME LIKE "a%a_" ESCAPE 'a';
+id	name	uid
+SELECT * FROM st WHERE NAME LIKE "\%\_";
+id	name	uid
+SELECT * FROM st WHERE NAME LIKE "\%_";
+id	name	uid
+1	%a	world
+2	%_	world
+SELECT * FROM st WHERE NAME LIKE "a%_" ESCAPE 'a';
+id	name	uid
+1	%a	world
+2	%_	world
+drop table st;
+create table st2(id int ,column_2 varchar(10),column_3 varchar(10))engine=tianmu;
+insert into st2 values(1,'_a\\\\','111111');
+insert into st2 values(2,'12%','%12%');
+insert into st2 values(3,'a_a','a%');
+insert into st2 values(4,'_a\\','_12%');
+insert into st2 values(5,'\\a','\\\\_a%12%');
+select * from st2 where column_2 like '%_a\\\%';
+id	column_2	column_3
+1	_a\\	111111
+select * from st2 where column_2 like '%?_a?\%' escape '?';
+id	column_2	column_3
+drop table st2;
+DROP DATABASE issue1157_test;

mysql-test/suite/tianmu/t/issue1157.test

@@ -0,0 +1,45 @@
+--source include/have_tianmu.inc
+
+--disable_warnings
+DROP DATABASE IF EXISTS issue1157_test;
+--enable_warnings
+
+CREATE DATABASE issue1157_test;
+USE issue1157_test;
+
+
+CREATE TABLE st(
+  `id` BIGINT(20) NOT NULL AUTO_INCREMENT,
+  `name` VARCHAR(255) DEFAULT NULL,
+  `uid` VARCHAR(11) DEFAULT NULL,
+  PRIMARY KEY (`id`)
+)engine=tianmu;
+
+INSERT INTO st (NAME,uid) VALUES('%a','world');
+INSERT INTO st (NAME,uid) VALUES('%_','world');
+
+SELECT * FROM st WHERE NAME LIKE "a%a_" ESCAPE 'a'; 
+
+SELECT * FROM st WHERE NAME LIKE "\%\_";
+
+SELECT * FROM st WHERE NAME LIKE "\%_";
+
+SELECT * FROM st WHERE NAME LIKE "a%_" ESCAPE 'a';
+
+drop table st;
+
+
+create table st2(id int ,column_2 varchar(10),column_3 varchar(10))engine=tianmu;
+insert into st2 values(1,'_a\\\\','111111');
+insert into st2 values(2,'12%','%12%');
+insert into st2 values(3,'a_a','a%');
+insert into st2 values(4,'_a\\','_12%');
+insert into st2 values(5,'\\a','\\\\_a%12%');
+
+select * from st2 where column_2 like '%_a\\\%';
+
+select * from st2 where column_2 like '%?_a?\%' escape '?';
+
+drop table st2;
+
+DROP DATABASE issue1157_test;

storage/tianmu/core/tianmu_attr_exqp.cpp

@@ -484,8 +484,12 @@ void TianmuAttr::EvaluatePack_Like_UTF(MIUpdatingIterator &mit, int dim, Descrip
   types::BString pattern;
   d.val1.vc->GetValueString(pattern, mit);
   size_t min_len = 0;  // the number of fixed characters
+  /*
+    When calculating the length of the matching string,
+    need to exclude wildcard characters and characters in ESCAPE
+  */
   for (uint i = 0; i < pattern.len_; i++)
-    if (pattern[i] != '%')
+    if (pattern[i] != '%' && pattern[i] != '\\' && pattern[i] != d.like_esc)
       min_len++;
   std::unordered_set<uint16_t> possible_ids;
   bool use_trie = false;