MySQL 8.4.3
Source Code Documentation
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Join planner classes. More...
#include <sys/types.h>
#include "my_inttypes.h"
#include "my_table_map.h"
#include "sql_optimizer.h"
Go to the source code of this file.
Classes | |
class | Optimize_table_order |
This class determines the optimal join order for tables within a basic query block, ie a query specification clause, possibly extended with semi-joined tables from embedded subqueries. More... | |
class | Join_tab_compare_default |
Typedefs | |
typedef ulonglong | nested_join_map |
Functions | |
table_map | get_lateral_deps (const JOIN_TAB &tab) |
Find the lateral dependencies of 'tab'. More... | |
void | get_partial_join_cost (JOIN *join, uint n_tables, double *cost_arg, double *rowcount_arg) |
Calculate a cost of given partial join order. More... | |
float | calculate_condition_filter (const JOIN_TAB *const tab, const Key_use *const keyuse, table_map used_tables, double fanout, bool is_join_buffering, bool write_to_trace, Opt_trace_object &parent_trace) |
Calculate 'Post read filtering' effect of JOIN::conds for table 'tab'. More... | |
double | find_cost_for_ref (const THD *thd, TABLE *table, unsigned keyno, double num_rows, double worst_seeks) |
Find the cost for a ref lookup on the given index, assumed to return “num_rows” rows. More... | |
Join planner classes.
typedef ulonglong nested_join_map |