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Fixed bug #14292: performance degradation for a benchmark query.

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This performance degradation was due to the fact that some
cost evaluation code added into 4.1 in the function find_best was
not merged into the code of the function best_access_path added
together with other code for greedy optimizer.
Added a parameter to the function print_plan. The parameter contains
accumulated cost for a given partial join.
 
The patch does not include a special test case since this performance
degradation is hard to reproduse with a simple example.

TODO: make the function find_best use the function best_access_path
in order to remove duplication of code which might result in incomplete
merges in the future.
This commit is contained in:
igor@rurik.mysql.com
2006-05-02 18:31:20 -07:00
parent 806564d754
commit ae4eb6b50f
5 changed files with 76 additions and 46 deletions
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4
sql/mysql_priv.h
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@@ -1066,8 +1066,8 @@ pthread_handler_t handle_manager(void *arg);
void print_where(COND *cond,const char *info);
void print_cached_tables(void);
void TEST_filesort(SORT_FIELD *sortorder,uint s_length);
void print_plan(JOIN* join, double read_time, double record_count,
uint idx, const char *info);
void print_plan(JOIN* join,uint idx, double record_count, double read_time,
double current_read_time, const char *info);
#endif
void mysql_print_status();
/* key.cc */