addresses #1803

implement ha_tokudb::index_read_last
using same implementation as every other storage engine

git-svn-id: file:///svn/mysql/tokudb-engine/src@12705 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -3618,6 +3618,12 @@ cleanup:
     TOKUDB_DBUG_RETURN(error);
 }
 
+
+int ha_tokudb::index_read_last(uchar * buf, const uchar * key, uint key_len) {
+    return(index_read(buf, key, key_len, HA_READ_PREFIX_LAST));    
+}
+
+
 //
 // Reads the previous row from the active index (cursor) into buf, and advances cursor
 // Parameters:

storage/tokudb/ha_tokudb.h

@@ -340,9 +340,7 @@ public:
     int index_end();
     int index_next_same(uchar * buf, const uchar * key, uint keylen); 
     int index_read(uchar * buf, const uchar * key, uint key_len, enum ha_rkey_function find_flag);
-#if 0
     int index_read_last(uchar * buf, const uchar * key, uint key_len);
-#endif
     int index_next(uchar * buf);
     int index_prev(uchar * buf);
     int index_first(uchar * buf);