* Fixed test results.
mysql-test/r/index_merge_ror.result:
Typo fix
mysql-test/r/rowid_order_bdb.result:
new index_merge EXPLAIN output format changes
mysql-test/r/rowid_order_innodb.result:
new index_merge EXPLAIN output format changes
sql/opt_range.cc:
Undo of previous fix:
If cost(full_scan_on_covering_index) < cost(best_range_scan) < cost(full_table_scan)
use full_scan_on_covering_index, not best_range_scan.
The fix affects read plan choice for more queries then initially anticipated, so I'm reverting it for now, will get back to this later
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
