Fixed bug when joining with caching.

Fixed race condition when using the binary log and INSERT DELAYED which could cause the binary log to have rows that was not yet written to MyISAM tables.


Docs/manual.texi:
  Changelog
mysql-test/r/null_key.result:
  Fix of testcase after changing optimizer to only use range keys if it would use a long part of the SAME key.
sql/sql_insert.cc:
  Fixed race condition with binary log and INSERT DELAYED
sql/sql_select.cc:
  Fixed bug when joining with caching

Docs/manual.texi

@@ -46785,7 +46785,7 @@ users use this code as the rest of the code and because of this we are
 not yet 100% confident in this code.
 
 @menu
-* News-3.23.46::                
+* News-3.23.46::                Changes in release 3.23.46
 * News-3.23.45::                Changes in release 3.23.45
 * News-3.23.44::                Changes in release 3.23.44
 * News-3.23.43::                Changes in release 3.23.43
@@ -46846,6 +46846,12 @@ One can now kill @code{ANALYZE},@code{REPAIR} and @code{OPTIMIZE TABLE} when
 the thread is waiting to get a lock on the table.
 @item
 Fixed race condition in @code{ANALYZE TABLE}.
+@item
+Fixed bug when joining with caching (unlikely to happen).
+@item
+Fixed race condition when using the binary log and @code{INSERT DELAYED}
+which could cause the binary log to have rows that was not yet written
+to MyISAM tables.
 @end itemize
 
 @node News-3.23.45, News-3.23.44, News-3.23.46, News-3.23.x

mysql-test/r/null_key.result

@@ -11,7 +11,7 @@ t1	index	NULL	a	9	NULL	12	where used; Using index
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	range	a,b	a	9	NULL	3	where used; Using index
 table	type	possible_keys	key	key_len	ref	rows	Extra
-t1	range	a,b	a	9	NULL	2	where used; Using index
+t1	ref	a,b	b	4	const	2	where used
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	ref	a,b	a	5	const	3	where used; Using index
 table	type	possible_keys	key	key_len	ref	rows	Extra

sql/sql_insert.cc

@@ -1099,7 +1099,7 @@ bool delayed_insert::handle_inserts(void)
 {
   int error;
   uint max_rows;
-  bool using_ignore=0;
+  bool using_ignore=0, using_bin_log=mysql_bin_log.is_open();
   delayed_row *row;
   DBUG_ENTER("handle_inserts");
 
@@ -1124,7 +1124,13 @@ bool delayed_insert::handle_inserts(void)
     max_rows= ~0;				// Do as much as possible
   }
 
-  table->file->extra(HA_EXTRA_WRITE_CACHE);
+  /*
+    We can't use row caching when using the binary log because if
+    we get a crash, then binary log will contain rows that are not yet
+    written to disk, which will cause problems in replication.
+  */
+  if (!using_bin_log)
+    table->file->extra(HA_EXTRA_WRITE_CACHE);
   pthread_mutex_lock(&mutex);
   while ((row=rows.get()))
   {
@@ -1161,7 +1167,7 @@ bool delayed_insert::handle_inserts(void)
     if (row->query && row->log_query)
     {
       mysql_update_log.write(&thd,row->query, row->query_length);
-      if (mysql_bin_log.is_open())
+      if (using_bin_log)
       {
 	thd.query_length = row->query_length;
 	Query_log_event qinfo(&thd, row->query);
@@ -1197,7 +1203,8 @@ bool delayed_insert::handle_inserts(void)
 	  /* This should never happen */
 	  sql_print_error(ER(ER_DELAYED_CANT_CHANGE_LOCK),table->real_name);
 	}
-	table->file->extra(HA_EXTRA_WRITE_CACHE);
+	if (!using_bin_log)
+	  table->file->extra(HA_EXTRA_WRITE_CACHE);
 	pthread_mutex_lock(&mutex);
 	thd.proc_info="insert";
       }

sql/sql_select.cc

@@ -1881,52 +1881,55 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
 ** Find how much space the prevous read not const tables takes in cache
 */
 
+static void calc_used_field_length(THD *thd, JOIN_TAB *join_tab)
+{
+  uint null_fields,blobs,fields,rec_length;
+  null_fields=blobs=fields=rec_length=0;
+
+  Field **f_ptr,*field;
+  for (f_ptr=join_tab->table->field ; (field= *f_ptr) ; f_ptr++)
+  {
+    if (field->query_id == thd->query_id)
+    {
+      uint flags=field->flags;
+      fields++;
+      rec_length+=field->pack_length();
+      if (flags & BLOB_FLAG)
+	blobs++;
+      if (!(flags & NOT_NULL_FLAG))
+	null_fields++;
+    }
+  }
+  if (null_fields)
+    rec_length+=(join_tab->table->null_fields+7)/8;
+  if (join_tab->table->maybe_null)
+    rec_length+=sizeof(my_bool);
+  if (blobs)
+  {
+    uint blob_length=(uint) (join_tab->table->file->mean_rec_length-
+			     (join_tab->table->reclength- rec_length));
+    rec_length+=(uint) max(4,blob_length);
+  }
+  join_tab->used_fields=fields;
+  join_tab->used_fieldlength=rec_length;
+  join_tab->used_blobs=blobs;
+}
+
+
 static uint
 cache_record_length(JOIN *join,uint idx)
 {
-  uint length;
+  uint length=0;
   JOIN_TAB **pos,**end;
   THD *thd=join->thd;
 
-  length=0;
   for (pos=join->best_ref+join->const_tables,end=join->best_ref+idx ;
        pos != end ;
        pos++)
   {
     JOIN_TAB *join_tab= *pos;
-    if (!join_tab->used_fieldlength)
-    {					/* Not calced yet */
-      uint null_fields,blobs,fields,rec_length;
-      null_fields=blobs=fields=rec_length=0;
-
-      Field **f_ptr,*field;
-      for (f_ptr=join_tab->table->field ; (field= *f_ptr) ; f_ptr++)
-      {
-	if (field->query_id == thd->query_id)
-	{
-	  uint flags=field->flags;
-	  fields++;
-	  rec_length+=field->pack_length();
-	  if (flags & BLOB_FLAG)
-	    blobs++;
-	  if (!(flags & NOT_NULL_FLAG))
-	    null_fields++;
-	}
-      }
-      if (null_fields)
-	rec_length+=(join_tab->table->null_fields+7)/8;
-      if (join_tab->table->maybe_null)
-	rec_length+=sizeof(my_bool);
-      if (blobs)
-      {
-	uint blob_length=(uint) (join_tab->table->file->mean_rec_length-
-				 (join_tab->table->reclength- rec_length));
-	rec_length+=(uint) max(4,blob_length);
-      }
-      join_tab->used_fields=fields;
-      join_tab->used_fieldlength=rec_length;
-      join_tab->used_blobs=blobs;
-    }
+    if (!join_tab->used_fieldlength)		/* Not calced yet */
+      calc_used_field_length(thd, join_tab);
     length+=join_tab->used_fieldlength;
   }
   return length;
@@ -2248,6 +2251,7 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
       used_tables|=current_map;
 
       if (tab->type == JT_REF && tab->quick &&
+	  tab->ref.key == tab->quick->index &&
 	  tab->ref.key_length < tab->quick->max_used_key_length)
       {
 	/* Range uses longer key;  Use this instead of ref on key */
@@ -5631,15 +5635,19 @@ join_init_cache(THD *thd,JOIN_TAB *tables,uint table_count)
   uint length,blobs,size;
   CACHE_FIELD *copy,**blob_ptr;
   JOIN_CACHE  *cache;
+  JOIN_TAB *join_tab;
   DBUG_ENTER("join_init_cache");
 
   cache= &tables[table_count].cache;
   cache->fields=blobs=0;
 
-  for (i=0 ; i < table_count ; i++)
+  join_tab=tables;
+  for (i=0 ; i < table_count ; i++,join_tab++)
   {
-    cache->fields+=tables[i].used_fields;
-    blobs+=tables[i].used_blobs;
+    if (!join_tab->used_fieldlength)		/* Not calced yet */
+      calc_used_field_length(thd, join_tab);
+    cache->fields+=join_tab->used_fields;
+    blobs+=join_tab->used_blobs;
   }
   if (!(cache->field=(CACHE_FIELD*)
 	sql_alloc(sizeof(CACHE_FIELD)*(cache->fields+table_count*2)+(blobs+1)*