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HEAP: Copies the key count to a backup variable and sets the key count to zero. That way, no HEAP function will ever try to touch any index. Re-enabling is done by copying back the backup variable. To avoid memory leak at table close, disable deletes all index trees. Re-enabling must be done with empty indexes and data anyway. Otherwise, the indexes would need to be repaired, wich HEAP is not capable of. MyISAM: Only the key_map is cleared and set. Re-enabling must be done with empty indexes and data. Otherwise, repair needs to be done which will enable all keys persistently. The former implementation disabled only non-unique keys and maked this persistent. The new implementation additionally can disable all keys, but only without making this persistent. Re-enabling all keys can be done without repair, if data file and indexes are empty. heap/heapdef.h: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Pulled hp_clear_keys() out of hp_clear(). heap/hp_clear.c: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Pulled hp_clear_keys() out of hp_clear(). Added the new functions for disabling and enabling keys and to ask for the key state. include/heap.h: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Added a new HP_SHARE element to save the key count while keys are disabled. Added declarations for the new functions. myisam/mi_open.c: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Added the new functions for disabling and enabling keys and to ask for the key state. myisam/myisamdef.h: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Added declarations for the new functions. sql/ha_heap.cc: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Pulled set_keys_for_scanning() out of open(). Added the new functions for disabling and enabling keys and to ask for the key state. sql/ha_heap.h: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Added declarations for the new functions. sql/ha_myisam.cc: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Extended disable_indexes() for all keys and no save. The argument is now 'mode' as it must handle different cases. Extended enable_indexes() for no save. The new feature needs the new argument 'mode' with the same semantics as in disable_indexes(). Added indexes_are_disabled() to ask for the key state. Extended the existing call to enable_indexes() by the new argument. sql/ha_myisam.h: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Modified the declarations of dis-/enable_indexes() for the new argument. Added the declaration of the new function to ask for the key state. sql/handler.h: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Added declarations for the operation modes for the key switching functions. Modified the declarations of dis-/enable_indexes() for the new argument. Added the declaration of the new function to ask for the key state. sql/sql_select.cc: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). In create_myisam_from_heap() take notice of disabled keys and disable them in the new table before copying the data. sql/sql_table.cc: WL#1687 - Optimize UNION DISTINCT ... UNION ALL (again). Modified the calls of dis-/enable_indexes() for the new argument.
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