Bug #37936: ASSERT_COLUMN_MARKED_FOR_WRITE in Field_datetime::store ,

Field_varstring::store
      
The code that temporary saved the bitmaps of the read set and the write set so that
it can set it to all columns for debug purposes was not expecting that the
table->read_set and table->write_set can be the same. And was always saving both in 
sequence.
As a result the original value was never restored.
Fixed by saving & restoring the original value only once if the two sets are the
same (in a special set of functions).

mysql-test/r/select.result:
  Bug #37936: test case
mysql-test/t/select.test:
  Bug #37936: test case
sql/item_cmpfunc.cc:
  Bug #37936: don't save/restore twice if the read and write sets are the same
sql/opt_range.cc:
  Bug #37936: don't save/restore twice if the read and write sets are the same
sql/table.h:
  Bug #37936: Make a designated set of functions that save/restore
  both the read and the write sets in a single call.

mysql-test/r/select.result

@@ -4358,3 +4358,29 @@ a
 4
 5
 DROP TABLE t1;
+CREATE TABLE A (date_key date);
+CREATE TABLE C (
+pk int,
+int_nokey int,
+int_key int,
+date_key date NOT NULL,
+date_nokey date,
+varchar_key varchar(1)
+);
+INSERT INTO C VALUES 
+(1,1,1,'0000-00-00',NULL,NULL),
+(1,1,1,'0000-00-00',NULL,NULL);
+SELECT 1 FROM C WHERE pk > ANY (SELECT 1 FROM C);
+1
+SELECT COUNT(DISTINCT 1) FROM C 
+WHERE date_key = (SELECT 1 FROM A WHERE C.date_key IS NULL) GROUP BY pk;
+COUNT(DISTINCT 1)
+SELECT date_nokey FROM C 
+WHERE int_key IN (SELECT 1 FROM A) 
+HAVING date_nokey = '10:41:7' 
+ORDER BY date_key;
+date_nokey
+Warnings:
+Warning	1292	Incorrect date value: '10:41:7' for column 'date_nokey' at row 1
+DROP TABLE A,C;
+End of 5.1 tests

mysql-test/t/select.test

@@ -3701,3 +3701,36 @@ SELECT a FROM t1 ORDER BY a LIMIT 2;
 SELECT a FROM t1 ORDER BY a LIMIT 2,4294967296;
 SELECT a FROM t1 ORDER BY a LIMIT 2,4294967297;
 DROP TABLE t1;
+
+#
+# Bug #37936: ASSERT_COLUMN_MARKED_FOR_WRITE in Field_datetime::store ,
+# Field_varstring::store
+#
+
+CREATE TABLE A (date_key date);
+
+CREATE TABLE C (
+  pk int,
+  int_nokey int,
+  int_key int,
+  date_key date NOT NULL,
+  date_nokey date,
+  varchar_key varchar(1)
+);
+
+INSERT INTO C VALUES 
+(1,1,1,'0000-00-00',NULL,NULL),
+(1,1,1,'0000-00-00',NULL,NULL);
+
+SELECT 1 FROM C WHERE pk > ANY (SELECT 1 FROM C);
+
+SELECT COUNT(DISTINCT 1) FROM C 
+  WHERE date_key = (SELECT 1 FROM A WHERE C.date_key IS NULL) GROUP BY pk; 
+SELECT date_nokey FROM C 
+  WHERE int_key IN (SELECT 1 FROM A) 
+  HAVING date_nokey = '10:41:7' 
+  ORDER BY date_key;
+
+DROP TABLE A,C;
+
+--echo End of 5.1 tests

sql/item_cmpfunc.cc

@@ -394,19 +394,16 @@ static bool convert_constant_item(THD *thd, Item_field *field_item,
     TABLE *table= field->table;
     ulong orig_sql_mode= thd->variables.sql_mode;
     enum_check_fields orig_count_cuted_fields= thd->count_cuted_fields;
-    my_bitmap_map *old_write_map;
-    my_bitmap_map *old_read_map;
+    my_bitmap_map *old_maps[2];
     ulonglong orig_field_val; /* original field value if valid */
 
-    LINT_INIT(old_write_map);
-    LINT_INIT(old_read_map);
+    LINT_INIT(old_maps[0]);
+    LINT_INIT(old_maps[1]);
     LINT_INIT(orig_field_val);
 
     if (table)
-    {
-      old_write_map= dbug_tmp_use_all_columns(table, table->write_set);
-      old_read_map= dbug_tmp_use_all_columns(table, table->read_set);
-    }
+      dbug_tmp_use_all_columns(table, old_maps, 
+                               table->read_set, table->write_set);
     /* For comparison purposes allow invalid dates like 2000-01-32 */
     thd->variables.sql_mode= (orig_sql_mode & ~MODE_NO_ZERO_DATE) | 
                              MODE_INVALID_DATES;
@@ -437,10 +434,7 @@ static bool convert_constant_item(THD *thd, Item_field *field_item,
     thd->variables.sql_mode= orig_sql_mode;
     thd->count_cuted_fields= orig_count_cuted_fields;
     if (table)
-    {
-      dbug_tmp_restore_column_map(table->write_set, old_write_map);
-      dbug_tmp_restore_column_map(table->read_set, old_read_map);
-    }
+      dbug_tmp_restore_column_maps(table->read_set, table->write_set, old_maps);
   }
   return result;
 }

sql/opt_range.cc

@@ -2668,7 +2668,7 @@ bool prune_partitions(THD *thd, TABLE *table, Item *pprune_cond)
   PART_PRUNE_PARAM prune_param;
   MEM_ROOT alloc;
   RANGE_OPT_PARAM  *range_par= &prune_param.range_param;
-  my_bitmap_map *old_read_set, *old_write_set;
+  my_bitmap_map *old_sets[2];
 
   prune_param.part_info= part_info;
   init_sql_alloc(&alloc, thd->variables.range_alloc_block_size, 0);
@@ -2682,8 +2682,8 @@ bool prune_partitions(THD *thd, TABLE *table, Item *pprune_cond)
     DBUG_RETURN(FALSE);
   }
   
-  old_write_set= dbug_tmp_use_all_columns(table, table->write_set);
-  old_read_set=  dbug_tmp_use_all_columns(table, table->read_set);
+  dbug_tmp_use_all_columns(table, old_sets, 
+                           table->read_set, table->write_set);
   range_par->thd= thd;
   range_par->table= table;
   /* range_par->cond doesn't need initialization */
@@ -2773,8 +2773,7 @@ all_used:
   retval= FALSE; // some partitions are used
   mark_all_partitions_as_used(prune_param.part_info);
 end:
-  dbug_tmp_restore_column_map(table->write_set, old_write_set);
-  dbug_tmp_restore_column_map(table->read_set,  old_read_set);
+  dbug_tmp_restore_column_maps(table->read_set, table->write_set, old_sets);
   thd->no_errors=0;
   thd->mem_root= range_par->old_root;
   free_root(&alloc,MYF(0));			// Return memory & allocator
@@ -11145,9 +11144,9 @@ print_key(KEY_PART *key_part, const uchar *key, uint used_length)
   String tmp(buff,sizeof(buff),&my_charset_bin);
   uint store_length;
   TABLE *table= key_part->field->table;
-  my_bitmap_map *old_write_set, *old_read_set;
-  old_write_set= dbug_tmp_use_all_columns(table, table->write_set);
-  old_read_set=  dbug_tmp_use_all_columns(table, table->read_set);
+  my_bitmap_map *old_sets[2];
+
+  dbug_tmp_use_all_columns(table, old_sets, table->read_set, table->write_set);
 
   for (; key < key_end; key+=store_length, key_part++)
   {
@@ -11173,8 +11172,7 @@ print_key(KEY_PART *key_part, const uchar *key, uint used_length)
     if (key+store_length < key_end)
       fputc('/',DBUG_FILE);
   }
-  dbug_tmp_restore_column_map(table->write_set, old_write_set);
-  dbug_tmp_restore_column_map(table->read_set, old_read_set);
+  dbug_tmp_restore_column_maps(table->read_set, table->write_set, old_sets);
 }
 
 
@@ -11182,18 +11180,16 @@ static void print_quick(QUICK_SELECT_I *quick, const key_map *needed_reg)
 {
   char buf[MAX_KEY/8+1];
   TABLE *table;
-  my_bitmap_map *old_read_map, *old_write_map;
+  my_bitmap_map *old_sets[2];
   DBUG_ENTER("print_quick");
   if (!quick)
     DBUG_VOID_RETURN;
   DBUG_LOCK_FILE;
 
   table= quick->head;
-  old_read_map=  dbug_tmp_use_all_columns(table, table->read_set);
-  old_write_map= dbug_tmp_use_all_columns(table, table->write_set);
+  dbug_tmp_use_all_columns(table, old_sets, table->read_set, table->write_set);
   quick->dbug_dump(0, TRUE);
-  dbug_tmp_restore_column_map(table->read_set, old_read_map);
-  dbug_tmp_restore_column_map(table->write_set, old_write_map);
+  dbug_tmp_restore_column_maps(table->read_set, table->write_set, old_sets);
 
   fprintf(DBUG_FILE,"other_keys: 0x%s:\n", needed_reg->print(buf));
 

sql/table.h

@@ -1692,5 +1692,35 @@ static inline void dbug_tmp_restore_column_map(MY_BITMAP *bitmap,
 #endif
 }
 
+
+/* 
+  Variant of the above : handle both read and write sets.
+  Provide for the possiblity of the read set being the same as the write set
+*/
+static inline void dbug_tmp_use_all_columns(TABLE *table,
+                                            my_bitmap_map **save,
+                                            MY_BITMAP *read_set,
+                                            MY_BITMAP *write_set)
+{
+#ifndef DBUG_OFF
+  save[0]= read_set->bitmap;
+  save[1]= write_set->bitmap;
+  (void) tmp_use_all_columns(table, read_set);
+  (void) tmp_use_all_columns(table, write_set);
+#endif
+}
+
+
+static inline void dbug_tmp_restore_column_maps(MY_BITMAP *read_set,
+                                                MY_BITMAP *write_set,
+                                                my_bitmap_map **old)
+{
+#ifndef DBUG_OFF
+  tmp_restore_column_map(read_set, old[0]);
+  tmp_restore_column_map(write_set, old[1]);
+#endif
+}
+
+
 size_t max_row_length(TABLE *table, const uchar *data);