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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
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@ -382,6 +382,11 @@ public:
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false otherwise
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*/
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virtual bool primary_key_is_clustered() { return false; }
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virtual int cmp_ref(const byte *ref1, const byte *ref2)
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{
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return memcmp(ref1, ref2, ref_length);
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}
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};
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/* Some extern variables used with handlers */
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