Changed meaning of HA_EXTRA_RESET and start of hidden primary keys for BDB tables

BitKeeper/etc/logging_ok

-bk@work.mysql.com
-davida@work.mysql.com
-jamppa@work.mysql.com
-jcole@ham.spaceapes.com
-jcole@jcole.burghcom.com
-jcole@nslinux.bedford.progress.com
-jcole@tetra.bedford.progress.com
-jcole@tetra.spaceapes.com
-matt@work.mysql.com
-monty@donna.mysql.com
-monty@work.mysql.com
-mwagner@evoq.home.mwagner.org
-nusphere@main.burghcom.com
-paul@central.snake.net
-paul@work.mysql.com
-sasha@mysql.sashanet.com
-sasha@work.mysql.com
-serg@infomag.ape.relarn.ru
-serg@serg.mysql.com
-serg@work.mysql.com
-sinisa@work.mysql.com
-spurr@nslinux.bedford.progress.com
-tim@localhost.polyesthetic.msg
-tim@threads.polyesthetic.msg
-tim@work.mysql.com
-tonu@work.mysql.com
+monty@tik.mysql.com

heap/hp_extra.c

@@ -29,6 +29,7 @@ int heap_extra(register HP_INFO *info, enum ha_extra_function function)
 
   switch (function) {
   case HA_EXTRA_RESET:
+  case HA_EXTRA_RESET_STATE:
     info->lastinx= -1;
     info->current_record= (ulong) ~0L;
     info->current_hash_ptr=0;

include/my_base.h

@@ -87,7 +87,8 @@ enum ha_extra_function {
   HA_EXTRA_REINIT_CACHE=20,		/* init cache from current record */
   HA_EXTRA_FORCE_REOPEN=21,		/* Datafile have changed on disk */
   HA_EXTRA_FLUSH,			/* Flush tables to disk */
-  HA_EXTRA_NO_ROWS			/* Don't write rows */
+  HA_EXTRA_NO_ROWS,			/* Don't write rows */
+  HA_EXTRA_RESET_STATE			/* Reset positions */
 };
 
 	/* The following is parameter to ha_panic() */

isam/extra.c

@@ -36,6 +36,14 @@ int nisam_extra(N_INFO *info, enum ha_extra_function function)
 
   switch (function) {
   case HA_EXTRA_RESET:
+    if (info->opt_flag & (READ_CACHE_USED | WRITE_CACHE_USED))
+    {
+      info->opt_flag&= ~(READ_CACHE_USED | WRITE_CACHE_USED);
+      error=end_io_cache(&info->rec_cache);
+    }
+    info->opt_flag&= ~(KEY_READ_USED | REMEMBER_OLD_POS);
+
+  case HA_EXTRA_RESET_STATE:
     info->lastinx= 0;			/* Use first index as def */
     info->int_pos=info->lastpos= NI_POS_ERROR;
     info->page_changed=1;

isam/pack_isam.c

@@ -2012,8 +2012,8 @@ static int mrg_rrnd(MRG_INFO *info,byte *buf)
   {
     isam_info= *(info->current=info->file);
     info->end=info->current+info->count;
-    nisam_extra(isam_info,HA_EXTRA_CACHE);
     nisam_extra(isam_info,HA_EXTRA_RESET);
+    nisam_extra(isam_info,HA_EXTRA_CACHE);
     filepos=isam_info->s->pack.header_length;
   }
   else
@@ -2035,8 +2035,8 @@ static int mrg_rrnd(MRG_INFO *info,byte *buf)
     info->current++;
     isam_info= *info->current;
     filepos=isam_info->s->pack.header_length;
-    nisam_extra(isam_info,HA_EXTRA_CACHE);
     nisam_extra(isam_info,HA_EXTRA_RESET);
+    nisam_extra(isam_info,HA_EXTRA_CACHE);
   }
 }
 

merge/extra.c

@@ -32,9 +32,9 @@ enum ha_extra_function function;
     info->cache_in_use=1;
   else
   {
-    if (function == HA_EXTRA_NO_CACHE)
+    if (function == HA_EXTRA_NO_CACHE || function == HA_EXTRA_RESET)
       info->cache_in_use=0;
-    if (function == HA_EXTRA_RESET)
+    if (function == HA_EXTRA_RESET || function == HA_EXTRA_RESET_STATE)
     {
       info->current_table=0;
       info->last_used_table=info->open_tables;

myisam/mi_extra.c

@@ -37,6 +37,24 @@ int mi_extra(MI_INFO *info, enum ha_extra_function function)
 
   switch (function) {
   case HA_EXTRA_RESET:
+    /*
+      Free buffers and reset the following flags:
+      EXTRA_CACHE, EXTRA_WRITE_CACHE, EXTRA_KEYREAD, EXTRA_QUICK
+    */
+    if (info->opt_flag & (READ_CACHE_USED | WRITE_CACHE_USED))
+    {
+      info->opt_flag&= ~(READ_CACHE_USED | WRITE_CACHE_USED);
+      error=end_io_cache(&info->rec_cache);
+    }
+#if defined(HAVE_MMAP) && defined(HAVE_MADVICE)
+    if (info->opt_flag & MEMMAP_USED)
+      madvise(share->file_map,share->state.state.data_file_length,MADV_RANDOM);
+#endif
+    info->opt_flag&= ~(KEY_READ_USED | REMEMBER_OLD_POS);    
+    info->quick_mode=0;
+    /* Fall through */
+
+  case HA_EXTRA_RESET_STATE:		/* Reset state (don't free buffers) */
     info->lastinx= 0;			/* Use first index as def */
     info->last_search_keypage=info->lastpos= HA_OFFSET_ERROR;
     info->page_changed=1;

myisam/myisampack.c

@@ -2104,8 +2104,8 @@ static int mrg_rrnd(MRG_INFO *info,byte *buf)
   {
     isam_info= *(info->current=info->file);
     info->end=info->current+info->count;
-    mi_extra(isam_info,HA_EXTRA_CACHE);
     mi_extra(isam_info,HA_EXTRA_RESET);
+    mi_extra(isam_info,HA_EXTRA_CACHE);
     filepos=isam_info->s->pack.header_length;
   }
   else
@@ -2127,8 +2127,8 @@ static int mrg_rrnd(MRG_INFO *info,byte *buf)
     info->current++;
     isam_info= *info->current;
     filepos=isam_info->s->pack.header_length;
-    mi_extra(isam_info,HA_EXTRA_CACHE);
     mi_extra(isam_info,HA_EXTRA_RESET);
+    mi_extra(isam_info,HA_EXTRA_CACHE);
   }
 }
 

myisammrg/myrg_extra.c

@@ -31,9 +31,9 @@ int myrg_extra(MYRG_INFO *info,enum ha_extra_function function)
     info->cache_in_use=1;
   else
   {
-    if (function == HA_EXTRA_NO_CACHE)
+    if (function == HA_EXTRA_NO_CACHE || function == HA_EXTRA_RESET)
       info->cache_in_use=0;
-    if (function == HA_EXTRA_RESET)
+    if (function == HA_EXTRA_RESET || function == HA_EXTRA_RESET_STATE)
     {
       info->current_table=0;
       info->last_used_table=info->open_tables;

sql/filesort.cc

@@ -330,7 +330,9 @@ static ha_rows find_all_keys(SORTPARAM *param, SQL_SELECT *select,
   next_pos=ref_pos;
   if (! indexfile && ! quick_select)
   {
-    file->reset();
+    file->reset();			// QQ; Shouldn't be needed
+    if (table->keyread)			// QQ Can be removed after the reset
+      file->extra(HA_EXTRA_KEYREAD);	// QQ is removed
     next_pos=(byte*) 0;			/* Find records in sequence */
     file->rnd_init();
     file->extra(HA_EXTRA_CACHE);	/* Quicker reads */

sql/ha_berkeley.cc

@@ -319,8 +319,14 @@ int ha_berkeley::open(const char *name, int mode, uint test_if_locked)
 
   /* Open other keys */
   bzero((char*) key_file,sizeof(*key_file)*table->keys);
-  key_used_on_scan=primary_key=table->primary_key;
-  key_file[primary_key]=file;
+  if ((key_used_on_scan=primary_key=table->primary_key) < MAX_KEY)
+    key_file[primary_key]=file;
+  else						// No primary key
+  {
+    hidden_primary_key=1;
+    if (!share->primary_key_inited)
+      update_auto_primary_key();
+  }
   bzero((char*) &current_row,sizeof(current_row));
 
   DB **ptr=key_file;
@@ -1387,8 +1393,6 @@ static BDB_SHARE *get_share(const char *table_name)
     if ((share=(BDB_SHARE *) my_malloc(sizeof(*share)+length+1,
 				       MYF(MY_WME | MY_ZEROFILL))))
     {
-      // pthread_mutex_init(&share->mutex);
-      // pthread_cond_init(&share->cond);
       share->table_name_length=length;
       share->table_name=(char*) (share+1);
       strmov(share->table_name,table_name);
@@ -1399,6 +1403,7 @@ static BDB_SHARE *get_share(const char *table_name)
 	return 0;
       }
       thr_lock_init(&share->lock);
+      pthread_mutex_init(&share->mutex);
     }
   }
   share->use_count++;
@@ -1413,10 +1418,26 @@ static void free_share(BDB_SHARE *share)
   {
     hash_delete(&bdb_open_tables, (gptr) share);
     thr_lock_delete(&share->lock);
-  //  pthread_mutex_destroy(&share->mutex);
+    pthread_mutex_destroy(&share->mutex);
     my_free((gptr) share, MYF(0));
   }
   pthread_mutex_unlock(&bdb_mutex);
 }
 
+
+void ha_berkeley::update_auto_primary_key()
+{
+  (void) extra(HA_EXTRA_KEYREAD);
+  pthread_mutex_lock(&share->mutex);
+  if (!share->primary_key_inited)
+  {
+    index_init(primary_key);
+    if (!index_last(table->record[1]))
+      share->auto_ident=current_ident;
+    index_end();
+  }
+  pthread_mutex_unlock(&share->mutex);
+  (void) extra(HA_EXTRA_NO_KEYREAD);
+}
+
 #endif /* HAVE_BERKELEY_DB */

sql/ha_berkeley.h

@@ -24,9 +24,12 @@
 #include <db.h>
 
 typedef struct st_berkeley_share {
+  ulonglong auto_ident;
   THR_LOCK lock;
+  pthread_mutex_t mutex;
   char *table_name;
   uint table_name_length,use_count;
+  my_bool inited;
 } BDB_SHARE;
 
 class ha_berkeley: public handler
@@ -44,7 +47,7 @@ class ha_berkeley: public handler
   ulong int_option_flag;
   ulong alloced_rec_buff_length;
   uint primary_key,last_dup_key;
-  bool fixed_length_row, fixed_length_primary_key;
+  bool fixed_length_row, fixed_length_primary_key, hidden_primary_key;
 
   bool  fix_rec_buff_for_blob(ulong length);
   ulong max_row_length(const byte *buf);