Merge mysql.com:/opt/local/work/mysql-4.1-root

into  mysql.com:/opt/local/work/mysql-5.0-root


BitKeeper/deleted/.del-rpl_ignore_table.result:
  Delete: mysql-test/r/rpl_ignore_table.result
BitKeeper/deleted/.del-rpl_multi_update4.result:
  Delete: mysql-test/r/rpl_multi_update4.result
BitKeeper/deleted/.del-rpl_ignore_table-slave.opt:
  Delete: mysql-test/t/rpl_ignore_table-slave.opt
BitKeeper/deleted/.del-rpl_ignore_table.test:
  Delete: mysql-test/t/rpl_ignore_table.test
BitKeeper/deleted/.del-rpl_multi_update4-slave.opt:
  Delete: mysql-test/t/rpl_multi_update4-slave.opt
BitKeeper/deleted/.del-disabled.def:
  Auto merged
BitKeeper/deleted/.del-rpl_multi_update4.test:
  Delete: mysql-test/t/rpl_multi_update4.test
heap/hp_create.c:
  Auto merged
mysql-test/r/date_formats.result:
  Auto merged
mysql-test/r/myisam.result:
  Auto merged
mysql-test/r/update.result:
  Auto merged
mysql-test/t/date_formats.test:
  Auto merged
mysql-test/t/heap.test:
  Auto merged
mysql-test/t/kill.test:
  Auto merged
mysql-test/t/update.test:
  Auto merged
ndb/include/mgmapi/mgmapi_config_parameters.h:
  Auto merged
ndb/test/ndbapi/testBlobs.cpp:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
sql/sql_select.h:
  Auto merged
configure.in:
  Manual merge.
libmysql/libmysql.c:
  Manual merge.
mysql-test/r/heap.result:
  Manual merge.
mysql-test/r/heap_hash.result:
  Manual merge.
mysql-test/r/kill.result:
  Manual merge.
sql/ha_heap.cc:
  Manual merge.
sql/ha_heap.h:
  Manual merge.
sql/item_timefunc.cc:
  Manual merge.
sql/sql_class.cc:
  Manual merge.
sql/sql_parse.cc:
  Manual merge.
sql/sql_update.cc:
  Manual merge.
tests/mysql_client_test.c:
  Manual merge.

1 files changed, 12 insertions, 2 deletions

diff --git a/sql/sql_update.cc b/sql/sql_update.cc
index 2ff8a4bc244..d319167b61d 100644
--- a/sql/sql_update.cc
+++ b/sql/sql_update.cc
@@ -308,7 +308,6 @@ int mysql_update(THD *thd,
       SORT_FIELD  *sortorder;
       ha_rows examined_rows;
 
-      used_index= MAX_KEY;                   // For call to init_read_record()
       table->sort.io_cache = (IO_CACHE *) my_malloc(sizeof(IO_CACHE),
 						    MYF(MY_FAE | MY_ZEROFILL));
       if (!(sortorder=make_unireg_sortorder(order, &length)) ||
@@ -339,10 +338,21 @@ int mysql_update(THD *thd,
       if (open_cached_file(&tempfile, mysql_tmpdir,TEMP_PREFIX,
 			   DISK_BUFFER_SIZE, MYF(MY_WME)))
 	goto err;
-      
+
       /* If quick select is used, initialize it before retrieving rows. */
       if (select && select->quick && select->quick->reset())
         goto err;
+
+      /*
+        When we get here, we have one of the following options:
+        A. used_index == MAX_KEY
+           This means we should use full table scan, and start it with
+           init_read_record call
+        B. used_index != MAX_KEY
+           B.1 quick select is used, start the scan with init_read_record
+           B.2 quick select is not used, this is full index scan (with LIMIT)
+               Full index scan must be started with init_read_record_idx
+      */
       if (used_index == MAX_KEY || (select && select->quick))
         init_read_record(&info,thd,table,select,0,1);
       else