MDEV-17508 Fix bug for spider when using "not like"

fix bug for spider where using "not like" (#890)

test case:
t1 is a spider engine table;
  CREATE TABLE `t1` (
  `id` int(11) NOT NULL DEFAULT '0',
  `name` char(64) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=SPIDER

query: "select * from t1 where name  not like 'x%' " would dispatch "select xxx name name like 'x%' " to remote mysqld, is wrong

sql/item_cmpfunc.h

@@ -1899,7 +1899,6 @@ class Item_func_like :public Item_bool_func2
 
   bool escape_used_in_parsing;
   bool use_sampling;
-  bool negated;
 
   DTCollation cmp_collation;
   String cmp_value1, cmp_value2;
@@ -1916,6 +1915,7 @@ protected:
                        Item_func::Functype type, Item *value);
 public:
   int escape;
+  bool negated;
 
   Item_func_like(THD *thd, Item *a, Item *b, Item *escape_arg, bool escape_used):
     Item_bool_func2(thd, a, b), canDoTurboBM(FALSE), pattern(0), pattern_len(0),

storage/spider/mysql-test/spider/r/pushdown_not_like.result

@@ -0,0 +1,63 @@
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3
+child3_1
+child3_2
+child3_3
+
+drop and create databases
+connection master_1;
+DROP DATABASE IF EXISTS auto_test_local;
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+connection child2_1;
+DROP DATABASE IF EXISTS auto_test_remote;
+CREATE DATABASE auto_test_remote;
+USE auto_test_remote;
+
+create table select test
+connection master_1;
+DROP TABLE IF EXISTS ta_l;
+CREATE TABLE ta_l (
+a INT,
+b CHAR(1),
+c DATETIME,
+PRIMARY KEY(a)
+) MASTER_1_ENGINE MASTER_1_CHARSET MASTER_1_COMMENT_2_1
+INSERT INTO ta_l (a, b, c) VALUES
+(1, 'a', '2018-11-01 10:21:39'),
+(2, 'b', '2015-06-30 23:59:59'),
+(3, 'c', '2013-11-01 01:01:01');
+
+spider not like bug fix test
+connection master_1;
+select * from ta_l where b not like 'a%';
+a	b	c
+2	b	2015-06-30 23:59:59
+3	c	2013-11-01 01:01:01
+connection child2_1;
+SELECT argument FROM mysql.general_log WHERE argument LIKE '%select%';
+argument
+select `a`,`b`,`c` from `auto_test_remote`.`ta_r` where (`b` not like 'a%')
+SELECT argument FROM mysql.general_log WHERE argument LIKE '%select%'
+
+deinit
+connection master_1;
+DROP DATABASE IF EXISTS auto_test_local;
+connection child2_1;
+DROP DATABASE IF EXISTS auto_test_remote;
+SET GLOBAL log_output = @old_log_output;
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3
+child3_1
+child3_2
+child3_3
+
+end of test

storage/spider/mysql-test/spider/t/pushdown_not_like.test

@@ -0,0 +1,138 @@
+--disable_warnings
+--disable_query_log
+--disable_result_log
+--source test_init.inc
+--enable_result_log
+--enable_query_log
+
+
+--echo
+--echo drop and create databases
+--connection master_1
+DROP DATABASE IF EXISTS auto_test_local;
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+if ($USE_CHILD_GROUP2)
+{
+  --connection child2_1
+  DROP DATABASE IF EXISTS auto_test_remote;
+  CREATE DATABASE auto_test_remote;
+  USE auto_test_remote;
+}
+--enable_warnings
+
+
+--echo
+--echo create table select test
+if ($USE_CHILD_GROUP2)
+{
+  if (!$OUTPUT_CHILD_GROUP2)
+  {
+    --disable_query_log
+    --disable_result_log
+  }
+  --connection child2_1
+  if ($OUTPUT_CHILD_GROUP2)
+  {
+    --disable_query_log
+    echo CHILD2_1_DROP_TABLES;
+    echo CHILD2_1_CREATE_TABLES;
+  }
+  --disable_warnings
+  eval $CHILD2_1_DROP_TABLES;
+  --enable_warnings
+  eval $CHILD2_1_CREATE_TABLES;
+  if ($OUTPUT_CHILD_GROUP2)
+  {
+    --enable_query_log
+  }
+  if ($USE_GENERAL_LOG)
+  {
+    SET @old_log_output = @@global.log_output;
+    TRUNCATE TABLE mysql.general_log;
+    set global log_output = 'TABLE';
+  }
+  if (!$OUTPUT_CHILD_GROUP2)
+  {
+    --enable_query_log
+    --enable_result_log
+  }
+}
+
+--connection master_1
+--disable_warnings
+DROP TABLE IF EXISTS ta_l;
+--enable_warnings
+--disable_query_log
+echo CREATE TABLE ta_l (
+  a INT,
+  b CHAR(1),
+  c DATETIME,
+  PRIMARY KEY(a)
+) MASTER_1_ENGINE MASTER_1_CHARSET MASTER_1_COMMENT_2_1;
+eval CREATE TABLE ta_l (
+  a INT,
+  b CHAR(1),
+  c DATETIME,
+  PRIMARY KEY(a)
+) $MASTER_1_ENGINE $MASTER_1_CHARSET $MASTER_1_COMMENT_2_1;
+--enable_query_log
+INSERT INTO ta_l (a, b, c) VALUES
+  (1, 'a', '2018-11-01 10:21:39'),
+  (2, 'b', '2015-06-30 23:59:59'),
+  (3, 'c', '2013-11-01 01:01:01');
+
+--echo
+--echo spider not like bug fix test
+if ($USE_CHILD_GROUP2)
+{
+  if (!$OUTPUT_CHILD_GROUP2)
+  {
+    --disable_query_log
+    --disable_result_log
+  }
+  --connection child2_1
+  if ($USE_GENERAL_LOG)
+  {
+    TRUNCATE TABLE mysql.general_log;
+  }
+  if (!$OUTPUT_CHILD_GROUP2)
+  {
+    --enable_query_log
+    --enable_result_log
+  }
+}
+
+--connection master_1
+select * from ta_l where b not like 'a%';
+if ($USE_CHILD_GROUP2)
+{
+  --connection child2_1
+  if ($USE_GENERAL_LOG)
+  {
+    SELECT argument FROM mysql.general_log WHERE argument LIKE '%select%';
+  }
+}
+
+
+--echo
+--echo deinit
+--disable_warnings
+--connection master_1
+DROP DATABASE IF EXISTS auto_test_local;
+if ($USE_CHILD_GROUP2)
+{
+  --connection child2_1
+  DROP DATABASE IF EXISTS auto_test_remote;
+  SET GLOBAL log_output = @old_log_output;
+}
+
+
+--disable_query_log
+--disable_result_log
+--source test_deinit.inc
+--enable_result_log
+--enable_query_log
+--enable_warnings
+--echo
+--echo end of test

storage/spider/spd_db_include.h

@@ -139,6 +139,8 @@ typedef st_spider_result SPIDER_RESULT;
 #define SPIDER_SQL_IN_LEN (sizeof(SPIDER_SQL_IN_STR) - 1)
 #define SPIDER_SQL_NOT_IN_STR "not in("
 #define SPIDER_SQL_NOT_IN_LEN (sizeof(SPIDER_SQL_NOT_IN_STR) - 1)
+#define SPIDER_SQL_NOT_LIKE_STR "not like"
+#define SPIDER_SQL_NOT_LIKE_LEN (sizeof(SPIDER_SQL_NOT_LIKE_STR) - 1)
 #define SPIDER_SQL_AS_CHAR_STR " as char"
 #define SPIDER_SQL_AS_CHAR_LEN (sizeof(SPIDER_SQL_AS_CHAR_STR) - 1)
 #define SPIDER_SQL_CAST_STR "cast("

storage/spider/spd_db_mysql.cc

@@ -3948,13 +3948,27 @@ int spider_db_mysql_util::open_item_func(
     case Item_func::LE_FUNC:
     case Item_func::GE_FUNC:
     case Item_func::GT_FUNC:
-    case Item_func::LIKE_FUNC:
       if (str)
       {
         func_name = (char*) item_func->func_name();
         func_name_length = strlen(func_name);
       }
       break;
+    case Item_func::LIKE_FUNC:
+      if (str)
+      {
+         if (((Item_func_like *)item_func)->negated)
+         {
+            func_name = SPIDER_SQL_NOT_LIKE_STR;
+            func_name_length = SPIDER_SQL_NOT_LIKE_LEN;
+         }
+         else
+         {
+            func_name = (char*)item_func->func_name();
+            func_name_length = strlen(func_name);
+         }
+      }
+      break;
     default:
       THD *thd = spider->trx->thd;
       SPIDER_SHARE *share = spider->share;