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Merge MWL#90 into 5.3-main

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This commit is contained in:
Sergey Petrunya
2011-04-30 04:59:05 +04:00
parent 2721e912ba 81c6f73ff2
commit 3098c21b8f
43 changed files with 4641 additions and 1968 deletions
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95
sql/sql_select.h
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@ -165,13 +165,25 @@ enum enum_nested_loop_state
typedef enum_nested_loop_state
(*Next_select_func)(JOIN *, struct st_join_table *, bool);
/*
Function prototype for reading first record for a join tab
RETURN
0 - OK
-1 - Record not found
Other - A fatal error
*/
typedef int (*Read_record_func)(struct st_join_table *tab);
Next_select_func setup_end_select_func(JOIN *join);
int rr_sequential(READ_RECORD *info);
int rr_sequential_and_unpack(READ_RECORD *info);
class JOIN_CACHE;
class SJ_TMP_TABLE;
class JOIN_TAB_RANGE;
typedef struct st_join_table {
st_join_table() {} /* Remove gcc warning */
@ -200,6 +212,21 @@ typedef struct st_join_table {
st_join_table *last_inner; /**< last table table for embedding outer join */
st_join_table *first_upper; /**< first inner table for embedding outer join */
st_join_table *first_unmatched; /**< used for optimization purposes only */
/*
For join tabs that are inside an SJM bush: root of the bush
*/
st_join_table *bush_root_tab;
/* TRUE <=> This join_tab is inside an SJM bush and is the last leaf tab here */
bool last_leaf_in_bush;
/*
ptr - this is a bush, and ptr points to description of child join_tab
range
NULL - this join tab has no bush children
*/
JOIN_TAB_RANGE *bush_children;
/* Special content for EXPLAIN 'Extra' column or NULL if none */
const char *info;
@ -237,7 +264,13 @@ typedef struct st_join_table {
method (but not 'index' for some reason), i.e. this matches method which
E(#records) is in found_records.
*/
ha_rows read_time;
double read_time;
/* psergey-todo: make the below have type double, like POSITION::records_read? */
ha_rows records_read;
/* Startup cost for execution */
double startup_cost;
double partial_join_cardinality;
@ -330,12 +363,10 @@ typedef struct st_join_table {
/*
Semi-join strategy to be used for this join table. This is a copy of
POSITION::sj_strategy field. This field is set up by the
fix_semijion_strategies_for_picked_join_order.
fix_semijoin_strategies_for_picked_join_order.
*/
uint sj_strategy;
struct st_join_table *first_sjm_sibling;
void cleanup();
inline bool is_using_loose_index_scan()
{
@ -450,9 +481,6 @@ enum_nested_loop_state sub_select_cache(JOIN *join, JOIN_TAB *join_tab, bool
end_of_records);
enum_nested_loop_state sub_select(JOIN *join,JOIN_TAB *join_tab, bool
end_of_records);
enum_nested_loop_state sub_select_sjm(JOIN *join, JOIN_TAB *join_tab,
bool end_of_records);
enum_nested_loop_state
end_send_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
bool end_of_records);
@ -600,26 +628,53 @@ inline bool sj_is_materialize_strategy(uint strategy)
return strategy >= SJ_OPT_MATERIALIZE;
}
class JOIN_TAB_RANGE: public Sql_alloc
{
public:
JOIN_TAB *start;
JOIN_TAB *end;
};
class JOIN :public Sql_alloc
{
JOIN(const JOIN &rhs); /**< not implemented */
JOIN& operator=(const JOIN &rhs); /**< not implemented */
public:
JOIN_TAB *join_tab,**best_ref;
JOIN_TAB *join_tab, **best_ref;
JOIN_TAB **map2table; ///< mapping between table indexes and JOIN_TABs
JOIN_TAB *join_tab_save; ///< saved join_tab for subquery reexecution
List<JOIN_TAB_RANGE> join_tab_ranges;
/*
Base tables participating in the join. After join optimization is done, the
tables are stored in the join order (but the only really important part is
that const tables are first).
*/
TABLE **table;
TABLE **all_tables;
/**
The table which has an index that allows to produce the requried ordering.
A special value of 0x1 means that the ordering will be produced by
passing 1st non-const table to filesort(). NULL means no such table exists.
*/
TABLE *sort_by_table;
uint tables; /**< Number of tables in the join */
/*
Number of tables in the join.
(In MySQL, it is named 'tables' and is also the number of elements in
join->join_tab array. In MariaDB, the latter is not true, so we've renamed
the variable)
*/
uint table_count;
uint outer_tables; /**< Number of tables that are not inside semijoin */
uint const_tables;
/*
Number of tables in the top join_tab array. Normally this matches
(join_tab_ranges.head()->end - join_tab_ranges.head()->start).
We keep it here so that it is saved/restored with JOIN::restore_tmp.
*/
uint top_join_tab_count;
uint send_group_parts;
bool group; /**< If query contains GROUP BY clause */
/**
@ -695,7 +750,6 @@ public:
/* We also maintain a stack of join optimization states in * join->positions[] */
/******* Join optimization state members end *******/
Next_select_func first_select;
/*
The cost of best complete join plan found so far during optimization,
after optimization phase - cost of picked join order (not taking into
@ -826,8 +880,12 @@ public:
bool union_part; ///< this subselect is part of union
bool optimized; ///< flag to avoid double optimization in EXPLAIN
/*
Subqueries that will need to be converted to semi-join nests, including
those converted to jtbm nests. The list is emptied when conversion is done.
*/
Array<Item_in_subselect> sj_subselects;
/* Temporary tables used to weed-out semi-join duplicates */
List<TABLE> sj_tmp_tables;
/* SJM nests that are executed with SJ-Materialization strategy */
@ -860,7 +918,8 @@ public:
{
join_tab= join_tab_save= 0;
table= 0;
tables= 0;
table_count= 0;
top_join_tab_count= 0;
const_tables= 0;
eliminated_tables= 0;
join_list= 0;
@ -915,7 +974,6 @@ public:
rollup.state= ROLLUP::STATE_NONE;
no_const_tables= FALSE;
first_select= sub_select;
outer_ref_cond= 0;
}
@ -977,7 +1035,7 @@ public:
}
inline table_map all_tables_map()
{
return (table_map(1) << tables) - 1;
return (table_map(1) << table_count) - 1;
}
/*
Return the table for which an index scan can be used to satisfy
@ -1010,6 +1068,12 @@ private:
void cleanup_item_list(List<Item> &items) const;
};
enum enum_with_bush_roots { WITH_BUSH_ROOTS, WITHOUT_BUSH_ROOTS};
enum enum_with_const_tables { WITH_CONST_TABLES, WITHOUT_CONST_TABLES};
JOIN_TAB *first_linear_tab(JOIN *join, enum enum_with_const_tables const_tbls);
JOIN_TAB *next_linear_tab(JOIN* join, JOIN_TAB* tab,
enum enum_with_bush_roots include_bush_roots);
typedef struct st_select_check {
uint const_ref,reg_ref;
@ -1257,6 +1321,7 @@ int safe_index_read(JOIN_TAB *tab);
COND *remove_eq_conds(THD *thd, COND *cond, Item::cond_result *cond_value);
int test_if_item_cache_changed(List<Cached_item> &list);
int join_init_read_record(JOIN_TAB *tab);
int join_read_record_no_init(JOIN_TAB *tab);
void set_position(JOIN *join,uint idx,JOIN_TAB *table,KEYUSE *key);
inline Item * and_items(Item* cond, Item *item)
{