Merge branch '5.5' into 10.0

mysql-test/suite/vcol/r/wrong_arena.result

+create table t1 (a datetime,
+# get_datetime_value
+b int as (a > 1),                             # Arg_comparator
+c int as (a in (1,2,3)),                      # in_datetime
+d int as ((a,a) in ((1,1),(2,1),(NULL,1))),   # cmp_item_datetime
+# other issues
+e int as ((a,1) in ((1,1),(2,1),(NULL,1)))    # cmp_item_row::alloc_comparators()
+);
+Warnings:
+Warning	1292	Incorrect datetime value: '1'
+Warning	1292	Incorrect datetime value: '2'
+Warning	1292	Incorrect datetime value: '3'
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` datetime DEFAULT NULL,
+  `b` int(11) AS (a > 1) VIRTUAL,
+  `c` int(11) AS (a in (1,2,3)) VIRTUAL,
+  `d` int(11) AS ((a,a) in ((1,1),(2,1),(NULL,1))) VIRTUAL,
+  `e` int(11) AS ((a,1) in ((1,1),(2,1),(NULL,1))) VIRTUAL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1292	Incorrect datetime value: '1'
+Warning	1292	Incorrect datetime value: '2'
+Warning	1292	Incorrect datetime value: '3'
+insert t1 (a) values ('2010-10-10 10:10:10');
+select * from t1;
+a	b	c	d	e
+2010-10-10 10:10:10	1	0	0	NULL
+Warnings:
+Warning	1292	Incorrect datetime value: '1'
+Warning	1292	Incorrect datetime value: '1'
+Warning	1292	Incorrect datetime value: '2'
+Warning	1292	Incorrect datetime value: '1'
+Warning	1292	Incorrect datetime value: '1'
+Warning	1292	Incorrect datetime value: '2'
+select * from t1;
+a	b	c	d	e
+2010-10-10 10:10:10	1	0	0	NULL
+Warnings:
+Warning	1292	Incorrect datetime value: '1'
+Warning	1292	Incorrect datetime value: '2'
+Warning	1292	Incorrect datetime value: '1'
+Warning	1292	Incorrect datetime value: '1'
+Warning	1292	Incorrect datetime value: '2'
+drop table t1;
+create table t1 (a datetime,
+b datetime as (least(a,1))                    # Item_func_min_max::get_date
+);
+insert t1 (a) values ('2010-10-10 10:10:10');
+select * from t1;
+a	b
+2010-10-10 10:10:10	0000-00-00 00:00:00
+Warnings:
+Warning	1292	Incorrect datetime value: '1'
+select * from t1;
+a	b
+2010-10-10 10:10:10	0000-00-00 00:00:00
+Warnings:
+Warning	1292	Incorrect datetime value: '1'
+drop table t1;

mysql-test/suite/vcol/t/wrong_arena.test

+#
+# This tests various issues when vcol items allocate memory (e.g. more items)
+# not in the TABLE::expr_arena.
+#
+
+#
+# MDEV-9690 concurrent queries with virtual columns crash in temporal code
+#
+create table t1 (a datetime,
+  # get_datetime_value
+  b int as (a > 1),                             # Arg_comparator
+  c int as (a in (1,2,3)),                      # in_datetime
+  d int as ((a,a) in ((1,1),(2,1),(NULL,1))),   # cmp_item_datetime
+  # other issues
+  e int as ((a,1) in ((1,1),(2,1),(NULL,1)))    # cmp_item_row::alloc_comparators()
+);
+show create table t1;
+connect con1, localhost, root;
+insert t1 (a) values ('2010-10-10 10:10:10');
+select * from t1;
+disconnect con1;
+connection default;
+select * from t1;
+drop table t1;
+
+connect con1, localhost, root;
+create table t1 (a datetime,
+  b datetime as (least(a,1))                    # Item_func_min_max::get_date
+);
+insert t1 (a) values ('2010-10-10 10:10:10');
+select * from t1;
+disconnect con1;
+connection default;
+select * from t1;
+drop table t1;

sql/item_cmpfunc.cc

@@ -798,7 +798,7 @@ int Arg_comparator::set_cmp_func(Item_result_field *owner_arg,
                                         Item **a1, Item **a2,
                                         Item_result type)
 {
-  thd= current_thd;
+  THD *thd= current_thd;
   owner= owner_arg;
   set_null= set_null && owner_arg;
   a= a1;
@@ -868,7 +868,6 @@ Item** Arg_comparator::cache_converted_constant(THD *thd_arg, Item **value,
 void Arg_comparator::set_datetime_cmp_func(Item_result_field *owner_arg,
                                            Item **a1, Item **b1)
 {
-  thd= current_thd;
   owner= owner_arg;
   a= a1;
   b= b1;
@@ -943,12 +942,10 @@ get_datetime_value(THD *thd, Item ***item_arg, Item **cache_arg,
   if (cache_arg && item->const_item() &&
       !(item->type() == Item::CACHE_ITEM && item->cmp_type() == TIME_RESULT))
   {
-    Query_arena backup;
-    Query_arena *save_arena= thd->switch_to_arena_for_cached_items(&backup);
-    Item_cache_temporal *cache= new Item_cache_temporal(f_type);
-    if (save_arena)
-      thd->set_query_arena(save_arena);
+    if (!thd)
+      thd= current_thd;
 
+    Item_cache_temporal *cache= new Item_cache_temporal(f_type);
     cache->store_packed(value, item);
     *cache_arg= cache;
     *item_arg= cache_arg;
@@ -983,12 +980,12 @@ int Arg_comparator::compare_datetime()
     owner->null_value= 1;
 
   /* Get DATE/DATETIME/TIME value of the 'a' item. */
-  a_value= get_datetime_value(thd, &a, &a_cache, *b, &a_is_null);
+  a_value= get_datetime_value(0, &a, &a_cache, *b, &a_is_null);
   if (a_is_null)
     return -1;
 
   /* Get DATE/DATETIME/TIME value of the 'b' item. */
-  b_value= get_datetime_value(thd, &b, &b_cache, *a, &b_is_null);
+  b_value= get_datetime_value(0, &b, &b_cache, *a, &b_is_null);
   if (b_is_null)
     return -1;
 
@@ -1006,10 +1003,10 @@ int Arg_comparator::compare_e_datetime()
   longlong a_value, b_value;
 
   /* Get DATE/DATETIME/TIME value of the 'a' item. */
-  a_value= get_datetime_value(thd, &a, &a_cache, *b, &a_is_null);
+  a_value= get_datetime_value(0, &a, &a_cache, *b, &a_is_null);
 
   /* Get DATE/DATETIME/TIME value of the 'b' item. */
-  b_value= get_datetime_value(thd, &b, &b_cache, *a, &b_is_null);
+  b_value= get_datetime_value(0, &b, &b_cache, *a, &b_is_null);
   return a_is_null || b_is_null ? a_is_null == b_is_null
                                 : a_value == b_value;
 }
@@ -3663,7 +3660,7 @@ void in_datetime::set(uint pos,Item *item)
   bool is_null;
   struct packed_longlong *buff= &((packed_longlong*) base)[pos];
 
-  buff->val= get_datetime_value(thd, &tmp_item, 0, warn_item, &is_null);
+  buff->val= get_datetime_value(0, &tmp_item, 0, warn_item, &is_null);
   buff->unsigned_flag= 1L;
 }
 
@@ -3671,7 +3668,7 @@ uchar *in_datetime::get_value(Item *item)
 {
   bool is_null;
   Item **tmp_item= lval_cache ? &lval_cache : &item;
-  tmp.val= get_datetime_value(thd, &tmp_item, &lval_cache, warn_item, &is_null);
+  tmp.val= get_datetime_value(0, &tmp_item, &lval_cache, warn_item, &is_null);
   if (item->null_value)
     return 0;
   tmp.unsigned_flag= 1L;
@@ -3915,7 +3912,7 @@ void cmp_item_datetime::store_value(Item *item)
 {
   bool is_null;
   Item **tmp_item= lval_cache ? &lval_cache : &item;
-  value= get_datetime_value(thd, &tmp_item, &lval_cache, warn_item, &is_null);
+  value= get_datetime_value(0, &tmp_item, &lval_cache, warn_item, &is_null);
 }
 
 
@@ -3924,7 +3921,7 @@ int cmp_item_datetime::cmp(Item *arg)
   bool is_null;
   Item **tmp_item= &arg;
   return value !=
-    get_datetime_value(thd, &tmp_item, 0, warn_item, &is_null);
+    get_datetime_value(0, &tmp_item, 0, warn_item, &is_null);
 }
 
 

sql/item_cmpfunc.h

@@ -45,7 +45,6 @@ class Arg_comparator: public Sql_alloc
   Arg_comparator *comparators;   // used only for compare_row()
   double precision;
   /* Fields used in DATE/DATETIME comparison. */
-  THD *thd;
   Item *a_cache, *b_cache;         // Cached values of a and b items
                                    //   when one of arguments is NULL.
   int set_compare_func(Item_result_field *owner, Item_result type);
@@ -61,10 +60,10 @@ class Arg_comparator: public Sql_alloc
   /* Allow owner function to use string buffers. */
   String value1, value2;
 
-  Arg_comparator():  set_null(TRUE), comparators(0), thd(0),
+  Arg_comparator():  set_null(TRUE), comparators(0),
     a_cache(0), b_cache(0) {};
   Arg_comparator(Item **a1, Item **a2): a(a1), b(a2),  set_null(TRUE),
-    comparators(0), thd(0), a_cache(0), b_cache(0) {};
+    comparators(0), a_cache(0), b_cache(0) {};
 
   int set_cmp_func(Item_result_field *owner_arg,
 			  Item **a1, Item **a2,
@@ -963,15 +962,13 @@ class in_longlong :public in_vector
 class in_datetime :public in_longlong
 {
 public:
-  THD *thd;
   /* An item used to issue warnings. */
   Item *warn_item;
   /* Cache for the left item. */
   Item *lval_cache;
 
   in_datetime(Item *warn_item_arg, uint elements)
-    :in_longlong(elements), thd(current_thd), warn_item(warn_item_arg),
-     lval_cache(0) {};
+    :in_longlong(elements), warn_item(warn_item_arg), lval_cache(0) {};
   void set(uint pos,Item *item);
   uchar *get_value(Item *item);
   Item* create_item()
@@ -1131,14 +1128,13 @@ class cmp_item_datetime :public cmp_item
 {
   longlong value;
 public:
-  THD *thd;
   /* Item used for issuing warnings. */
   Item *warn_item;
   /* Cache for the left item. */
   Item *lval_cache;
 
   cmp_item_datetime(Item *warn_item_arg)
-    :thd(current_thd), warn_item(warn_item_arg), lval_cache(0) {}
+    : warn_item(warn_item_arg), lval_cache(0) {}
   void store_value(Item *item);
   int cmp(Item *arg);
   int compare(cmp_item *ci);

sql/item_func.cc

@@ -2853,7 +2853,6 @@ void Item_func_min_max::fix_length_and_dec()
   decimals=0;
   max_length=0;
   maybe_null=0;
-  thd= current_thd;
   cmp_type=args[0]->result_type();
 
   for (uint i=0 ; i < arg_count ; i++)
@@ -2926,13 +2925,11 @@ bool Item_func_min_max::get_date(MYSQL_TIME *ltime, ulonglong fuzzy_date)
   {
     Item **arg= args + i;
     bool is_null;
-    longlong res= get_datetime_value(thd, &arg, 0, compare_as_dates, &is_null);
+    longlong res= get_datetime_value(0, &arg, 0, compare_as_dates, &is_null);
 
     /* Check if we need to stop (because of error or KILL) and stop the loop */
-    if (thd->is_error() || args[i]->null_value)
-    {
+    if (args[i]->null_value)
       return (null_value= 1);
-    }
 
     if (i == 0 || (res < min_max ? cmp_sign : -cmp_sign) > 0)
       min_max= res;

sql/item_func.h

@@ -1077,7 +1077,6 @@ class Item_func_min_max :public Item_func
   int cmp_sign;
   /* An item used for issuing warnings while string to DATETIME conversion. */
   Item *compare_as_dates;
-  THD *thd;
 protected:
   enum_field_types cached_field_type;
 public:

sql/sql_class.cc

@@ -1054,7 +1054,6 @@ THD::THD()
 
   m_internal_handler= NULL;
   m_binlog_invoker= INVOKER_NONE;
-  arena_for_cached_items= 0;
   memset(&invoker_user, 0, sizeof(invoker_user));
   memset(&invoker_host, 0, sizeof(invoker_host));
   prepare_derived_at_open= FALSE;

sql/sql_class.h

@@ -3676,26 +3676,7 @@ class THD :public Statement,
     }
   }
 
-private:
-  /* 
-    This reference points to the table arena when the expression
-    for a virtual column is being evaluated
-  */ 
-  Query_arena *arena_for_cached_items;
-
 public:
-  void reset_arena_for_cached_items(Query_arena *new_arena)
-  {
-    arena_for_cached_items= new_arena;
-  }
-  Query_arena *switch_to_arena_for_cached_items(Query_arena *backup)
-  {
-    if (!arena_for_cached_items)
-      return 0;
-    set_n_backup_active_arena(arena_for_cached_items, backup);
-    return backup;
-  }
-
   void clear_wakeup_ready() { wakeup_ready= false; }
   /*
     Sleep waiting for others to wake us up with signal_wakeup_ready().

sql/table.cc

@@ -6704,7 +6704,9 @@ int update_virtual_fields(THD *thd, TABLE *table,
   int error __attribute__ ((unused))= 0;
   DBUG_ASSERT(table && table->vfield);
 
-  thd->reset_arena_for_cached_items(table->expr_arena);
+  Query_arena backup_arena;
+  thd->set_n_backup_active_arena(table->expr_arena, &backup_arena);
+
   /* Iterate over virtual fields in the table */
   for (vfield_ptr= table->vfield; *vfield_ptr; vfield_ptr++)
   {
@@ -6722,7 +6724,7 @@ int update_virtual_fields(THD *thd, TABLE *table,
       DBUG_PRINT("info", ("field '%s' - skipped", vfield->field_name));
     }
   }
-  thd->reset_arena_for_cached_items(0);
+  thd->restore_active_arena(table->expr_arena, &backup_arena);
   DBUG_RETURN(0);
 }