Merge sanja.is.com.ua:/home/bell/mysql/bk/work-4.1

into  sanja.is.com.ua:/home/bell/mysql/bk/work-mrg-5.0

mysql-test/r/func_math.result

@@ -165,3 +165,8 @@ drop table t1;
 select abs(-2) * -2;
 abs(-2) * -2
 -4
+create table t1 (i int);
+insert into t1 values (1);
+select rand(i) from t1;
+ERROR HY000: Incorrect arguments to RAND
+drop table t1;

mysql-test/r/ps.result

@@ -335,39 +335,37 @@ create table t1 (a int);
 insert into t1 (a) values (1), (2), (3), (4);
 set @precision=10000000000;
 select rand(), 
-cast(rand(10)*@precision as unsigned integer),
-cast(rand(a)*@precision as unsigned integer) from t1;
-rand()	cast(rand(10)*@precision as unsigned integer)	cast(rand(a)*@precision as unsigned integer)
--	6570515219	-
--	1282061302	-
--	6698761160	-
--	9647622201	-
+cast(rand(10)*@precision as unsigned integer) from t1;
+rand()	cast(rand(10)*@precision as unsigned integer)
+-	6570515219
+-	1282061302
+-	6698761160
+-	9647622201
 prepare stmt from
 "select rand(), 
         cast(rand(10)*@precision as unsigned integer),
-        cast(rand(a)*@precision as unsigned integer),
         cast(rand(?)*@precision as unsigned integer) from t1";
 set @var=1;
 execute stmt using @var;
-rand()	cast(rand(10)*@precision as unsigned integer)	cast(rand(a)*@precision as unsigned integer)	cast(rand(?)*@precision as unsigned integer)
--	6570515219	-	4054035371
--	1282061302	-	8716141803
--	6698761160	-	1418603212
--	9647622201	-	944590960
+rand()	cast(rand(10)*@precision as unsigned integer)	cast(rand(?)*@precision as unsigned integer)
+-	6570515219	-
+-	1282061302	-
+-	6698761160	-
+-	9647622201	-
 set @var=2;
 execute stmt using @var;
-rand()	cast(rand(10)*@precision as unsigned integer)	cast(rand(a)*@precision as unsigned integer)	cast(rand(?)*@precision as unsigned integer)
--	6570515219	1559528654	6555866465
--	1282061302	6238114970	1223466192
--	6698761160	6511989195	6449731873
--	9647622201	3845601374	8578261098
+rand()	cast(rand(10)*@precision as unsigned integer)	cast(rand(?)*@precision as unsigned integer)
+-	6570515219	6555866465
+-	1282061302	1223466192
+-	6698761160	6449731873
+-	9647622201	8578261098
 set @var=3;
 execute stmt using @var;
-rand()	cast(rand(10)*@precision as unsigned integer)	cast(rand(a)*@precision as unsigned integer)	cast(rand(?)*@precision as unsigned integer)
--	6570515219	1559528654	9057697559
--	1282061302	6238114970	3730790581
--	6698761160	6511989195	1480860534
--	9647622201	3845601374	6211931236
+rand()	cast(rand(10)*@precision as unsigned integer)	cast(rand(?)*@precision as unsigned integer)
+-	6570515219	9057697559
+-	1282061302	3730790581
+-	6698761160	1480860534
+-	9647622201	6211931236
 drop table t1;
 deallocate prepare stmt;
 create database mysqltest1;

mysql-test/t/func_math.test

@@ -107,4 +107,13 @@ drop table t1;
 #
 select abs(-2) * -2;
 
+#
+# Bug #6172 RAND(a) should only accept constant values as arguments
+#
+create table t1 (i int);
+insert into t1 values (1);
+--error 1210
+select rand(i) from t1;
+drop table t1;
+
 # End of 4.1 tests

mysql-test/t/ps.test

@@ -371,12 +371,10 @@ insert into t1 (a) values (1), (2), (3), (4);
 set @precision=10000000000;
 --replace_column 1 - 3 -
 select rand(), 
-       cast(rand(10)*@precision as unsigned integer),
-       cast(rand(a)*@precision as unsigned integer) from t1;
+       cast(rand(10)*@precision as unsigned integer) from t1;
 prepare stmt from
 "select rand(), 
         cast(rand(10)*@precision as unsigned integer),
-        cast(rand(a)*@precision as unsigned integer),
         cast(rand(?)*@precision as unsigned integer) from t1";
 set @var=1;
 --replace_column 1 - 3 -

sql/item_func.cc

@@ -1874,6 +1874,11 @@ bool Item_func_rand::fix_fields(THD *thd,Item **ref)
   used_tables_cache|= RAND_TABLE_BIT;
   if (arg_count)
   {					// Only use argument once in query
+    if (!args[0]->const_during_execution())
+    {
+      my_error(ER_WRONG_ARGUMENTS, MYF(0), "RAND");
+      return TRUE;
+    }
     /*
       Allocate rand structure once: we must use thd->stmt_arena
       to create rand in proper mem_root if it's a prepared statement or

sql/mysql_priv.h

@@ -545,6 +545,7 @@ struct Query_cache_query_flags
 #define query_cache_store_query(A, B) query_cache.store_query(A, B)
 #define query_cache_destroy() query_cache.destroy()
 #define query_cache_result_size_limit(A) query_cache.result_size_limit(A)
+#define query_cache_init() query_cache.init()
 #define query_cache_resize(A) query_cache.resize(A)
 #define query_cache_set_min_res_unit(A) query_cache.set_min_res_unit(A)
 #define query_cache_invalidate3(A, B, C) query_cache.invalidate(A, B, C)
@@ -558,6 +559,7 @@ struct Query_cache_query_flags
 #define query_cache_store_query(A, B)
 #define query_cache_destroy()
 #define query_cache_result_size_limit(A)
+#define query_cache_init()
 #define query_cache_resize(A)
 #define query_cache_set_min_res_unit(A)
 #define query_cache_invalidate3(A, B, C)

sql/sql_cache.cc

@@ -573,13 +573,18 @@ void query_cache_insert(NET *net, const char *packet, ulong length)
 {
   DBUG_ENTER("query_cache_insert");
 
-#ifndef DBUG_OFF
-  // Check if we have called query_cache.wreck() (which disables the cache)
-  if (query_cache.query_cache_size == 0)
+  STRUCT_LOCK(&query_cache.structure_guard_mutex);
+  /*
+    It is very unlikely that following condition is TRUE (it is possible
+    only if other thread is resizing cache), so we check it only after guard
+    mutex lock
+  */
+  if (unlikely(query_cache.query_cache_size == 0))
+  {
+    STRUCT_UNLOCK(&query_cache.structure_guard_mutex);
     DBUG_VOID_RETURN;
-#endif
+  }
 
-  STRUCT_LOCK(&query_cache.structure_guard_mutex);
   Query_cache_block *query_block = ((Query_cache_block*)
 				    net->query_cache_query);
   if (query_block)
@@ -623,14 +628,20 @@ void query_cache_abort(NET *net)
 {
   DBUG_ENTER("query_cache_abort");
 
-#ifndef DBUG_OFF
-  // Check if we have called query_cache.wreck() (which disables the cache)
-  if (query_cache.query_cache_size == 0)
-    DBUG_VOID_RETURN;
-#endif
   if (net->query_cache_query != 0)	// Quick check on unlocked structure
   {
     STRUCT_LOCK(&query_cache.structure_guard_mutex);
+    /*
+      It is very unlikely that following condition is TRUE (it is possible
+      only if other thread is resizing cache), so we check it only after guard
+      mutex lock
+    */
+    if (unlikely(query_cache.query_cache_size == 0))
+    {
+      STRUCT_UNLOCK(&query_cache.structure_guard_mutex);
+      DBUG_VOID_RETURN;
+    }
+
     Query_cache_block *query_block = ((Query_cache_block*)
 				       net->query_cache_query);
     if (query_block)			// Test if changed by other thread
@@ -652,11 +663,6 @@ void query_cache_end_of_result(THD *thd)
 {
   DBUG_ENTER("query_cache_end_of_result");
 
-#ifndef DBUG_OFF
-  // Check if we have called query_cache.wreck() (which disables the cache)
-  if (query_cache.query_cache_size == 0) DBUG_VOID_RETURN;
-#endif
-
   if (thd->net.query_cache_query != 0)	// Quick check on unlocked structure
   {
 #ifdef EMBEDDED_LIBRARY
@@ -664,6 +670,17 @@ void query_cache_end_of_result(THD *thd)
 		       emb_count_querycache_size(thd));
 #endif
     STRUCT_LOCK(&query_cache.structure_guard_mutex);
+    /*
+      It is very unlikely that following condition is TRUE (it is possible
+      only if other thread is resizing cache), so we check it only after guard
+      mutex lock
+    */
+    if (unlikely(query_cache.query_cache_size == 0))
+    {
+      STRUCT_UNLOCK(&query_cache.structure_guard_mutex);
+      DBUG_VOID_RETURN;
+    }
+
     Query_cache_block *query_block = ((Query_cache_block*)
 				      thd->net.query_cache_query);
     if (query_block)
@@ -743,9 +760,14 @@ ulong Query_cache::resize(ulong query_cache_size_arg)
   DBUG_ENTER("Query_cache::resize");
   DBUG_PRINT("qcache", ("from %lu to %lu",query_cache_size,
 			query_cache_size_arg));
-  free_cache(0);
+  DBUG_ASSERT(initialized);
+  STRUCT_LOCK(&structure_guard_mutex);
+  if (query_cache_size > 0)
+    free_cache();
   query_cache_size= query_cache_size_arg;
-  DBUG_RETURN(::query_cache_size= init_cache());
+  ::query_cache_size= init_cache();
+  STRUCT_UNLOCK(&structure_guard_mutex);
+  DBUG_RETURN(::query_cache_size);
 }
 
 
@@ -1438,7 +1460,7 @@ void Query_cache::destroy()
   }
   else
   {
-    free_cache(1);
+    free_cache();
     pthread_mutex_destroy(&structure_guard_mutex);
     initialized = 0;
   }
@@ -1467,8 +1489,6 @@ ulong Query_cache::init_cache()
   int align;
 
   DBUG_ENTER("Query_cache::init_cache");
-  if (!initialized)
-    init();
   approx_additional_data_size = (sizeof(Query_cache) +
 				 sizeof(gptr)*(def_query_hash_size+
 					       def_table_hash_size));
@@ -1526,14 +1546,9 @@ ulong Query_cache::init_cache()
     goto err;
   query_cache_size -= additional_data_size;
 
-  STRUCT_LOCK(&structure_guard_mutex);
-
-  if (!(cache = (byte *)
+  if (!(cache= (byte *)
         my_malloc_lock(query_cache_size+additional_data_size, MYF(0))))
-  {
-    STRUCT_UNLOCK(&structure_guard_mutex);
     goto err;
-  }
 
   DBUG_PRINT("qcache", ("cache length %lu, min unit %lu, %u bins",
 		      query_cache_size, min_allocation_unit, mem_bin_num));
@@ -1629,7 +1644,6 @@ ulong Query_cache::init_cache()
 
   queries_in_cache = 0;
   queries_blocks = 0;
-  STRUCT_UNLOCK(&structure_guard_mutex);
   DBUG_RETURN(query_cache_size +
 	      additional_data_size + approx_additional_data_size);
 
@@ -1645,6 +1659,7 @@ void Query_cache::make_disabled()
 {
   DBUG_ENTER("Query_cache::make_disabled");
   query_cache_size= 0;
+  queries_blocks= 0;
   free_memory= 0;
   bins= 0;
   steps= 0;
@@ -1656,14 +1671,11 @@ void Query_cache::make_disabled()
 }
 
 
-void Query_cache::free_cache(my_bool destruction)
+void Query_cache::free_cache()
 {
   DBUG_ENTER("Query_cache::free_cache");
   if (query_cache_size > 0)
   {
-    if (!destruction)
-      STRUCT_LOCK(&structure_guard_mutex);
-
     flush_cache();
 #ifndef DBUG_OFF
     if (bins[0].free_blocks == 0)
@@ -1685,8 +1697,6 @@ void Query_cache::free_cache(my_bool destruction)
     make_disabled();
     hash_free(&queries);
     hash_free(&tables);
-    if (!destruction)
-      STRUCT_UNLOCK(&structure_guard_mutex);
   }
   DBUG_VOID_RETURN;
 }
@@ -2401,7 +2411,19 @@ Query_cache::allocate_block(ulong len, my_bool not_less, ulong min,
   }
 
   if (!under_guard)
+  {
     STRUCT_LOCK(&structure_guard_mutex);
+    /*
+      It is very unlikely that following condition is TRUE (it is possible
+      only if other thread is resizing cache), so we check it only after
+      guard mutex lock
+    */
+    if (unlikely(query_cache.query_cache_size == 0))
+    {
+      STRUCT_UNLOCK(&structure_guard_mutex);
+      DBUG_RETURN(0);
+    }
+  }
 
   /* Free old queries until we have enough memory to store this block */
   Query_cache_block *block;
@@ -2947,6 +2969,17 @@ void Query_cache::pack_cache()
 {
   DBUG_ENTER("Query_cache::pack_cache");
   STRUCT_LOCK(&structure_guard_mutex);
+  /*
+    It is very unlikely that following condition is TRUE (it is possible
+    only if other thread is resizing cache), so we check it only after
+    guard mutex lock
+  */
+  if (unlikely(query_cache_size == 0))
+  {
+    STRUCT_UNLOCK(&structure_guard_mutex);
+    DBUG_VOID_RETURN;
+  }
+
   DBUG_EXECUTE("check_querycache",query_cache.check_integrity(1););
 
   byte *border = 0;
@@ -3256,6 +3289,7 @@ my_bool Query_cache::join_results(ulong join_limit)
   STRUCT_LOCK(&structure_guard_mutex);
   if (queries_blocks != 0)
   {
+    DBUG_ASSERT(query_cache_size > 0);
     Query_cache_block *block = queries_blocks;
     do
     {
@@ -3552,7 +3586,19 @@ my_bool Query_cache::check_integrity(bool not_locked)
     DBUG_RETURN(0);
   }
   if (!not_locked)
+  {
     STRUCT_LOCK(&structure_guard_mutex);
+    /*
+      It is very unlikely that following condition is TRUE (it is possible
+      only if other thread is resizing cache), so we check it only after
+      guard mutex lock
+    */
+    if (unlikely(query_cache_size == 0))
+    {
+      STRUCT_UNLOCK(&query_cache.structure_guard_mutex);
+      DBUG_RETURN(0);
+    }
+  }
 
   if (hash_check(&queries))
   {

sql/sql_cache.h

@@ -327,10 +327,9 @@ protected:
     Following function control structure_guard_mutex
     by themself or don't need structure_guard_mutex
   */
-  void init();
   ulong init_cache();
   void make_disabled();
-  void free_cache(my_bool destruction);
+  void free_cache();
   Query_cache_block *write_block_data(ulong data_len, gptr data,
 				       ulong header_len,
 				       Query_cache_block::block_type type,
@@ -366,6 +365,8 @@ protected:
 	      uint def_query_hash_size = QUERY_CACHE_DEF_QUERY_HASH_SIZE,
 	      uint def_table_hash_size = QUERY_CACHE_DEF_TABLE_HASH_SIZE);
 
+  /* initialize cache (mutex) */
+  void init();
   /* resize query cache (return real query size, 0 if disabled) */
   ulong resize(ulong query_cache_size);
   /* set limit on result size */