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authorunknown <sergefp@mysql.com>2004-05-13 01:38:40 +0400
committerunknown <sergefp@mysql.com>2004-05-13 01:38:40 +0400
commit3600d09ab4323098676fa51c869a787fec9d42cc (patch)
tree34118ff1da06b90ade9507174ddccf92c228286a /include/my_base.h
parent7e95a257e08e7760f5432704ab22d2d37e6e5f7a (diff)
downloadmariadb-git-3600d09ab4323098676fa51c869a787fec9d42cc.tar.gz
This is first cset for WL#1394 "Optimize index merge when all involved index ranges include only values with equal keys"
The main idea is to exploit the fact that key scans for "key=const" return ordered sequences of rowids. include/my_base.h: Added HA_EXTRA_KEYREAD_PRESERVE_FIELDS flag include/my_bitmap.h: Added a couple of utility functions include/my_sys.h: Added my_conunt_bits_ushort function innobase/include/row0mysql.h: Added support for HA_EXTRA_KEYREAD_PRESERVE_FIELDS innobase/row/row0sel.c: Added support for HA_EXTRA_KEYREAD_PRESERVE_FIELDS mysys/my_bit.c: Added my_count_bits_ushort function mysys/my_bitmap.c: Added a couple of utility functions sql/ha_berkeley.cc: Added cmp_ref rowid comparison function. sql/ha_berkeley.h: Added cmp_ref rowid comparison function. sql/ha_heap.h: Added cmp_ref rowid comparison function. sql/ha_innodb.cc: Added cmp_ref rowid comparison function and support from HA_EXTRA_KEYREAD_PRESERVE_FIELDS sql/ha_innodb.h: Added cmp_ref rowid comparison function. sql/handler.h: Added cmp_ref rowid comparison function. sql/opt_range.cc: Added QUICK_ROR_{INTERSECT,UNION}_SELECT classes and related optimizer code sql/opt_range.h: Added QUICK_ROR_{INTERSECT,UNION}_SELECT classes sql/sql_delete.cc: Changed to use new ROWID comparison function also always call quick->reset() for quick selects sql/sql_select.cc: Account for new quick select types sql/sql_select.h: New, proper rowid ordering/comparison function to be used with Unique class etc. sql/sql_test.cc: Account for new quick select types sql/sql_update.cc: Account for new quick select types
Diffstat (limited to 'include/my_base.h')
-rw-r--r--include/my_base.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/my_base.h b/include/my_base.h
index 89b46de520f..19843d413c4 100644
--- a/include/my_base.h
+++ b/include/my_base.h
@@ -132,7 +132,13 @@ enum ha_extra_function {
HA_EXTRA_RETRIEVE_ALL_COLS,
HA_EXTRA_PREPARE_FOR_DELETE,
HA_EXTRA_PREPARE_FOR_UPDATE, /* Remove read cache if problems */
- HA_EXTRA_PRELOAD_BUFFER_SIZE /* Set buffer size for preloading */
+ HA_EXTRA_PRELOAD_BUFFER_SIZE, /* Set buffer size for preloading */
+ /*
+ When using HA_EXTRA_KEYREAD, overwrite only key member fields and keep
+ other fields intact. When this is off (by default) InnoDB will use memcpy
+ to overwrite entire row.
+ */
+ HA_EXTRA_KEYREAD_PRESERVE_FIELDS
};
/* The following is parameter to ha_panic() */