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WL#2985 "Partition-pruning", "range walking" addition: better comments.

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sergefp@mysql.com
2006-01-05 17:47:07 +03:00
parent e40e1003f7
commit 62942018e1
3 changed files with 105 additions and 37 deletions
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5
sql/handler.h
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@ -690,11 +690,10 @@ public:
/*
A bitmap of partitions used by the current query.
Usage pattern:
* It is guaranteed that all partitions are set to be unused on query start.
* The handler->extra(HA_EXTRA_RESET) call at query start/end sets all
partitions to be unused.
* Before index/rnd_init(), partition pruning code sets the bits for used
partitions.
* The handler->extra(HA_EXTRA_RESET) call at query end sets all partitions
to be unused.
*/
MY_BITMAP used_partitions;