Fixed bug with ORDER BY on BDB tables.

New benchmarks tests

BitKeeper/etc/logging_ok

@@ -1,5 +1 @@
-monty@donna.mysql.com
+monty@tik.mysql.com
-mwagner@evoq.home.mwagner.org
-sasha@mysql.sashanet.com
-serg@serg.mysql.com
-tim@threads.polyesthetic.msg

sql-bench/test-insert.sh

@@ -270,7 +270,7 @@ for ($i=1 ; $i <= $small_loop_count ; $i++)
   {
     if (!$error++)
     {
-      print "Warning: Got $found_rows rows when selecting a hole table of " . ($total_rows) . " rows\nContact the database or DBD author!\n";
+      print "Warning: Got $found_rows rows when selecting a whole table of " . ($total_rows) . " rows\nContact the database or DBD author!\n";
     }
   }
   $count+=$found_rows;
@@ -280,44 +280,125 @@ $end_time=new Benchmark;
 print "Time for select_big ($small_loop_count:$count): " .
     timestr(timediff($end_time, $loop_time),"all") . "\n";
 
+#
+# Do a lot of different ORDER BY queries
+#
+
 $loop_time=new Benchmark;
-$estimated=0;
+$estimated=$rows=0;
-$rows=0;
+for ($i=1 ; $i <= $small_loop_count ; $i++)
-$count=0;
-for ($i=1 ; $i <= $small_loop_count/2 ; $i++)
 {
   $rows+=fetch_all_rows($dbh,"select id from bench1 order by id",1);
-  $rows+=fetch_all_rows($dbh,"select id from bench1 order by id desc",1);
-  $count+=2;
   $end_time=new Benchmark;
-  last if ($estimated=predict_query_time($loop_time,$end_time,\$count,$count,
+  last if ($estimated=predict_query_time($loop_time,$end_time,\$i,$i,
 					 $small_loop_count));
 }
 if ($estimated)
 { print "Estimated time"; }
 else
 { print "Time"; }
-print " for order_by_key ($count:$rows): " .
+print " for order_by_big_key ($small_loop_count:$rows): " .
   timestr(timediff($end_time, $loop_time),"all") . "\n";
 
 $loop_time=new Benchmark;
-$estimated=0;
+$estimated=$rows=0;
-$rows=0;
+for ($i=1 ; $i <= $small_loop_count ; $i++)
-$count=0;
-for ($i=1 ; $i <= $small_loop_count/2 ; $i++)
 {
-  $rows+=fetch_all_rows($dbh,"select id2 from bench1 order by id2",1);
+  $rows+=fetch_all_rows($dbh,"select id from bench1 order by id desc",1);
-  $rows+=fetch_all_rows($dbh,"select id2 from bench1 order by id2 desc",1);
-  $count+=2;
   $end_time=new Benchmark;
-  last if ($estimated=predict_query_time($loop_time,$end_time,\$count,$count,
+  last if ($estimated=predict_query_time($loop_time,$end_time,\$i,$i,
 					 $small_loop_count));
 }
 if ($estimated)
 { print "Estimated time"; }
 else
 { print "Time"; }
-print " for order_by ($count:$rows): " .
+print " for order_by_big_key_desc ($small_loop_count:$rows): " .
+  timestr(timediff($end_time, $loop_time),"all") . "\n";
+
+$loop_time=new Benchmark;
+$estimated=$rows=0;
+for ($i=1 ; $i <= $small_loop_count ; $i++)
+{
+  $rows+=fetch_all_rows($dbh,"select id3 from bench1 order by id3",1);
+  $end_time=new Benchmark;
+  last if ($estimated=predict_query_time($loop_time,$end_time,\$i,$i,
+					 $small_loop_count));
+}
+if ($estimated)
+{ print "Estimated time"; }
+else
+{ print "Time"; }
+print " for order_by_big_key2 ($small_loop_count:$rows): " .
+  timestr(timediff($end_time, $loop_time),"all") . "\n";
+
+$loop_time=new Benchmark;
+$estimated=$rows=0;
+for ($i=1 ; $i <= $small_loop_count ; $i++)
+{
+  $rows+=fetch_all_rows($dbh,"select id2 from bench1 order by id3",1);
+  $end_time=new Benchmark;
+  last if ($estimated=predict_query_time($loop_time,$end_time,\$i,$i,
+					 $small_loop_count));
+}
+if ($estimated)
+{ print "Estimated time"; }
+else
+{ print "Time"; }
+print " for order_by_big_key_diff ($small_loop_count:$rows): " .
+  timestr(timediff($end_time, $loop_time),"all") . "\n";
+
+
+$loop_time=new Benchmark;
+$estimated=$rows=0;
+for ($i=1 ; $i <= $small_loop_count ; $i++)
+{
+  $rows+=fetch_all_rows($dbh,"select id from bench1 order by id2,id3",1);
+  $end_time=new Benchmark;
+  last if ($estimated=predict_query_time($loop_time,$end_time,\$i,$i,
+					 $small_loop_count));
+}
+if ($estimated)
+{ print "Estimated time"; }
+else
+{ print "Time"; }
+print " for order_by_big ($small_loop_count:$rows): " .
+  timestr(timediff($end_time, $loop_time),"all") . "\n";
+
+$loop_time=new Benchmark;
+$estimated=$rows=0;
+for ($i=1 ; $i <= $small_loop_count ; $i++)
+{
+  $start=$opt_loop_count/$small_loop_count*$i;
+  $end=$start+$i;
+  $rows+=fetch_all_rows($dbh,"select dummy1 from bench1 where id>=$start and id <= $end order by id",1);
+  $end_time=new Benchmark;
+  last if ($estimated=predict_query_time($loop_time,$end_time,\$i,$i,
+					 $small_loop_count));
+}
+if ($estimated)
+{ print "Estimated time"; }
+else
+{ print "Time"; }
+print " for order_by_key ($small_loop_count:$rows): " .
+  timestr(timediff($end_time, $loop_time),"all") . "\n";
+
+$loop_time=new Benchmark;
+$estimated=$rows=0;
+for ($i=1 ; $i <= $small_loop_count ; $i++)
+{
+  $start=$opt_loop_count/$small_loop_count*$i;
+  $end=$start+$small_loop_count;
+  $rows+=fetch_all_rows($dbh,"select id2 from bench1 where id3>=$start and id3 <= $end order by id3",1);
+  $end_time=new Benchmark;
+  last if ($estimated=predict_query_time($loop_time,$end_time,\$i,$i,
+					 $small_loop_count));
+}
+if ($estimated)
+{ print "Estimated time"; }
+else
+{ print "Time"; }
+print " for order_by_key2_diff ($small_loop_count:$rows): " .
   timestr(timediff($end_time, $loop_time),"all") . "\n";
 
 #

sql/filesort.cc

@@ -148,7 +148,7 @@ ha_rows filesort(TABLE **table, SORT_FIELD *sortorder, uint s_length,
   else
   {
     table[0]->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);/* Get record-count */
-    records=table[0]->file->records+EXTRA_RECORDS;
+    records=table[0]->file->estimate_number_of_rows();
     selected_records_file= 0;
   }
   if (param.sort_length == param.ref_length && records > param.max_rows)
@@ -168,8 +168,8 @@ ha_rows filesort(TABLE **table, SORT_FIELD *sortorder, uint s_length,
   memavl=sortbuff_size;
   while (memavl >= MIN_SORT_MEMORY)
   {
-    if ((records+1)*(param.sort_length+sizeof(char*))+sizeof(BUFFPEK)*10 <
+    if ((ulonglong) (records+1)*(param.sort_length+sizeof(char*))+sizeof(BUFFPEK)*10 <
-	(ulong) memavl)
+	(ulonglong) memavl)
       param.keys=(uint) records+1;
     else
     {
@@ -382,6 +382,7 @@ static ha_rows find_all_keys(SORTPARAM *param, SQL_SELECT *select,
     }
     if (*killed)
     {
+      DBUG_PRINT("info",("Sort killed by user"));
       (void) file->extra(HA_EXTRA_NO_CACHE);
       file->rnd_end();
       DBUG_RETURN(HA_POS_ERROR);		/* purecov: inspected */

sql/ha_berkeley.cc

@@ -25,8 +25,9 @@
     We will need an updated Berkeley DB version for this.
   - Killing threads that has got a 'deadlock'
   - SHOW TABLE STATUS should give more information about the table.
-  - Get a more accurate count of the number of rows.
+  - Get a more accurate count of the number of rows (estimate_number_of_rows()).
-    We could store the found number of rows when the table is scanned.
+    We could store the found number of rows when the table is scanned and
+    then increment the counter for each attempted write.
   - We will need a manager thread that calls flush_logs, removes old
     logs and makes checkpoints at given intervals.
   - When not using UPDATE IGNORE, don't make a sub transaction but abort
@@ -42,7 +43,6 @@
   - LOCK TABLES
   - CHAR keys
   - BLOBS
-  - delete from t1;
 */
 
 
@@ -1297,7 +1297,7 @@ void ha_berkeley::info(uint flag)
   DBUG_ENTER("info");
   if (flag & HA_STATUS_VARIABLE)
   {
-    records = HA_BERKELEY_ROWS_IN_TABLE; // Just to get optimisations right
+    records = estimate_number_of_rows(); 		// Just to get optimisations right
     deleted = 0;
   }
   else if (flag & HA_STATUS_ERRKEY)
@@ -1607,4 +1607,20 @@ void ha_berkeley::update_auto_primary_key()
   pthread_mutex_unlock(&share->mutex);
 }
 
+/*
+  Return an estimated of the number of rows in the table.
+  Used when sorting to allocate buffers and by the optimizer.
+*/
+
+ha_rows ha_berkeley::estimate_number_of_rows()
+{
+  ulonglong max_ident;
+  if (!hidden_primary_key)
+    return INT_MAX32;
+  pthread_mutex_lock(&share->mutex);
+  max_ident=share->auto_ident+EXTRA_RECORDS;
+  pthread_mutex_unlock(&share->mutex);
+  return (ha_rows) min(max_ident,(ulonglong) INT_MAX32);
+}
+
 #endif /* HAVE_BERKELEY_DB */

sql/ha_berkeley.h

@@ -92,6 +92,7 @@ class ha_berkeley: public handler
   uint max_key_parts()     const { return MAX_REF_PARTS; }
   uint max_key_length()    const { return MAX_KEY_LENGTH; }
   uint extra_rec_buf_length()	 { return BDB_HIDDEN_PRIMARY_KEY_LENGTH; }
+  ha_rows estimate_number_of_rows();
   bool fast_key_read()	   { return 1;}
   bool has_transactions()  { return 1;}
 

sql/handler.h

@@ -203,6 +203,7 @@ public:
   virtual bool fast_key_read() { return 0;}
   virtual bool has_transactions(){ return 0;}
   virtual uint extra_rec_buf_length() { return 0; }
+  virtual ha_rows estimate_number_of_rows() { return records+EXTRA_RECORDS; }
 
   virtual int index_init(uint idx) { active_index=idx; return 0;}
   virtual int index_end() {return 0; }

sql/sql_class.h

@@ -57,7 +57,7 @@ typedef struct st_master_info
   pthread_mutex_t lock;
   bool inited;
 
-  st_master_info():inited(0),pending(0)
+  st_master_info() :pending(0), inited(0)
   { host[0] = 0; user[0] = 0; password[0] = 0;}
   
   inline void inc_pending(ulonglong val)