1 files changed, 68 insertions, 0 deletions
diff --git a/storage/heap/hp_rfirst.c b/storage/heap/hp_rfirst.c
new file mode 100644
index 00000000..60596a2c
--- /dev/null
+++ b/storage/heap/hp_rfirst.c
@@ -0,0 +1,68 @@
+/* Copyright (c) 2000-2002, 2004-2007 MySQL AB
+   Use is subject to license terms
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA */
+
+#include "heapdef.h"
+
+/* Read first record with the current key */
+
+int heap_rfirst(HP_INFO *info, uchar *record, int inx)
+{
+  HP_SHARE *share = info->s;
+  HP_KEYDEF *keyinfo = share->keydef + inx;
+  
+  DBUG_ENTER("heap_rfirst");
+  info->lastinx= inx;
+  info->key_version= info->s->key_version;
+
+  if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
+  {
+    uchar *pos;
+
+    if ((pos = tree_search_edge(&keyinfo->rb_tree, info->parents,
+                                &info->last_pos, offsetof(TREE_ELEMENT, left))))
+    {
+      memcpy(&pos, pos + (*keyinfo->get_key_length)(keyinfo, pos), 
+	     sizeof(uchar*));
+      info->current_ptr = pos;
+      memcpy(record, pos, (size_t)share->reclength);
+      /*
+        If we're performing index_first on a table that was taken from
+        table cache, info->lastkey_len is initialized to previous query.
+        Thus we set info->lastkey_len to proper value for subsequent
+        heap_rnext() calls.
+        This is needed for DELETE queries only, otherwise this variable is
+        not used.
+        Note that the same workaround may be needed for heap_rlast(), but
+        for now heap_rlast() is never used for DELETE queries.
+      */
+      info->lastkey_len= 0;
+      info->update = HA_STATE_AKTIV;
+    }
+    else
+    {
+      info->update= HA_STATE_NO_KEY;
+      my_errno = HA_ERR_END_OF_FILE;
+      DBUG_RETURN(my_errno);
+    }
+    DBUG_RETURN(0);
+  }
+  else
+  {
+    /* We can't scan a non existing key value with hash index */
+    my_errno= HA_ERR_WRONG_COMMAND;
+    DBUG_RETURN(my_errno);
+  }
+}