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Commit c4097382 authored by unknown's avatar unknown
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Automatic merge.

parents b1a177e4 1e6bd6b4
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Showing with 277 additions and 111 deletions
mysql-test/r/subselect_partial_match.result
View file @ c4097382
set @save_optimizer_switch=@@optimizer_switch;
drop table if exists t1, t2; drop table if exists t1, t2;
# #
# LP BUG#608744 # LP BUG#608744
# #
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch="materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off"; set @@optimizer_switch="materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off";
create table t1 (a1 char(1), a2 char(1)); create table t1 (a1 char(1), a2 char(1));
insert into t1 values (NULL, 'b'); insert into t1 values (NULL, 'b');
...@@ -11,7 +11,6 @@ insert into t2 values ('a','b'), ('c', 'd'); ...@@ -11,7 +11,6 @@ insert into t2 values ('a','b'), ('c', 'd');
select * from t1 where (a1, a2) NOT IN (select b1, b2 from t2); select * from t1 where (a1, a2) NOT IN (select b1, b2 from t2);
a1 a2 a1 a2
drop table t1,t2; drop table t1,t2;
set @@optimizer_switch=@save_optimizer_switch;
# #
# LP BUG#601156 # LP BUG#601156
# #
...@@ -21,7 +20,6 @@ INSERT INTO t1 VALUES (4,NULL); ...@@ -21,7 +20,6 @@ INSERT INTO t1 VALUES (4,NULL);
CREATE TABLE t2 (b1 int DEFAULT NULL, b2 int DEFAULT NULL); CREATE TABLE t2 (b1 int DEFAULT NULL, b2 int DEFAULT NULL);
INSERT INTO t2 VALUES (6,NULL); INSERT INTO t2 VALUES (6,NULL);
INSERT INTO t2 VALUES (NULL,0); INSERT INTO t2 VALUES (NULL,0);
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on'; set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on';
EXPLAIN EXTENDED EXPLAIN EXTENDED
SELECT * FROM (SELECT * FROM t1 WHERE a1 NOT IN (SELECT b2 FROM t2)) table1; SELECT * FROM (SELECT * FROM t1 WHERE a1 NOT IN (SELECT b2 FROM t2)) table1;
...@@ -31,11 +29,9 @@ id select_type table type possible_keys key key_len ref rows filtered Extra ...@@ -31,11 +29,9 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
Warnings: Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (not(<in_optimizer>(`test`.`t1`.`a1`,`test`.`t1`.`a1` in ( <materialize> (select `test`.`t2`.`b2` from `test`.`t2` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `<subquery3>`.`b2`))))))) Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (not(<in_optimizer>(`test`.`t1`.`a1`,`test`.`t1`.`a1` in ( <materialize> (select `test`.`t2`.`b2` from `test`.`t2` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `<subquery3>`.`b2`)))))))
DROP TABLE t1, t2; DROP TABLE t1, t2;
set @@optimizer_switch=@save_optimizer_switch;
# #
# LP BUG#613009 Crash in Ordered_key::get_field_idx # LP BUG#613009 Crash in Ordered_key::get_field_idx
# #
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off'; set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off';
create table t1 (a1 char(3) DEFAULT NULL, a2 char(3) DEFAULT NULL); create table t1 (a1 char(3) DEFAULT NULL, a2 char(3) DEFAULT NULL);
insert into t1 values (NULL, 'a21'), (NULL, 'a22'); insert into t1 values (NULL, 'a21'), (NULL, 'a22');
...@@ -46,7 +42,6 @@ id select_type table type possible_keys key key_len ref rows Extra ...@@ -46,7 +42,6 @@ id select_type table type possible_keys key key_len ref rows Extra
select * from t1 where (a1, a2) not in (select a1, a2 from t1); select * from t1 where (a1, a2) not in (select a1, a2 from t1);
a1 a2 a1 a2
drop table t1; drop table t1;
set @@optimizer_switch=@save_optimizer_switch;
# #
# LP BUG#680058 void Ordered_key::add_key(rownum_t): # LP BUG#680058 void Ordered_key::add_key(rownum_t):
# Assertion `key_buff_elements && cur_key_idx < key_buff_elements' failed # Assertion `key_buff_elements && cur_key_idx < key_buff_elements' failed
...@@ -55,10 +50,99 @@ create table t1 (f1 char(1), f2 char(1)); ...@@ -55,10 +50,99 @@ create table t1 (f1 char(1), f2 char(1));
insert into t1 values ('t', '0'), ('0', 't'); insert into t1 values ('t', '0'), ('0', 't');
create table t2 (f3 char(1), f4 char(1)); create table t2 (f3 char(1), f4 char(1));
insert into t2 values ('t', NULL), ('t', NULL), ('d', 'y'); insert into t2 values ('t', NULL), ('t', NULL), ('d', 'y');
set @save_optimizer_switch=@@optimizer_switch; set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,semijoin=off';
SET @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,semijoin=off';
select * from t1 where (f1, f2) not in (select * from t2); select * from t1 where (f1, f2) not in (select * from t2);
f1 f2 f1 f2
0 t 0 t
set @@optimizer_switch=@save_optimizer_switch;
drop table t1, t2; drop table t1, t2;
#
# LP BUG#809245 Second assertion `bit < (map)->n_bits' with partial_match_merge
#
CREATE TABLE t1 (d varchar(32)) ;
INSERT INTO t1 VALUES ('r');
CREATE TABLE t2 ( a int, c varchar(32)) ;
INSERT INTO t2 VALUES (5,'r');
CREATE TABLE t3 ( a int NOT NULL , d varchar(32)) ;
INSERT INTO t3 VALUES (10,'g');
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,in_to_exists=off';
EXPLAIN SELECT *
FROM t1
WHERE (t1.d , t1.d) NOT IN (
SELECT t3.d , t2.c
FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY t3 system NULL NULL NULL NULL 1
2 SUBQUERY t2 system NULL NULL NULL NULL 1
SELECT *
FROM t1
WHERE (t1.d , t1.d) NOT IN (
SELECT t3.d , t2.c
FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
d
r
set @@optimizer_switch='materialization=off,in_to_exists=on';
EXPLAIN SELECT *
FROM t1
WHERE (t1.d , t1.d) NOT IN (
SELECT t3.d , t2.c
FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY t3 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
SELECT *
FROM t1
WHERE (t1.d , t1.d) NOT IN (
SELECT t3.d , t2.c
FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
d
r
drop table t1, t2, t3;
#
# LP BUG#809266 Diverging results with partial_match_rowid_merge=on
#
CREATE TABLE t1 (c int) ;
INSERT INTO t1 VALUES (0),(0);
CREATE TABLE t2 (a int, b int) ;
INSERT INTO t2 VALUES (6,3), (9,NULL);
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,in_to_exists=off';
EXPLAIN
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
c
0
0
EXPLAIN
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
c
0
0
set @@optimizer_switch='materialization=off,in_to_exists=on';
EXPLAIN
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
c
0
0
EXPLAIN
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
c
0
0
drop table t1, t2;
set @@optimizer_switch=@save_optimizer_switch;
mysql-test/t/subselect_partial_match.test
View file @ c4097382
...@@ -3,6 +3,8 @@ ...@@ -3,6 +3,8 @@
# MWL#68: Subquery optimization: Efficient NOT IN execution with NULLs # MWL#68: Subquery optimization: Efficient NOT IN execution with NULLs
# #
set @save_optimizer_switch=@@optimizer_switch;
--disable_warnings --disable_warnings
drop table if exists t1, t2; drop table if exists t1, t2;
--enable_warnings --enable_warnings
...@@ -10,7 +12,6 @@ drop table if exists t1, t2; ...@@ -10,7 +12,6 @@ drop table if exists t1, t2;
--echo # --echo #
--echo # LP BUG#608744 --echo # LP BUG#608744
--echo # --echo #
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch="materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off"; set @@optimizer_switch="materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off";
create table t1 (a1 char(1), a2 char(1)); create table t1 (a1 char(1), a2 char(1));
insert into t1 values (NULL, 'b'); insert into t1 values (NULL, 'b');
...@@ -18,7 +19,6 @@ create table t2 (b1 char(1), b2 char(2)); ...@@ -18,7 +19,6 @@ create table t2 (b1 char(1), b2 char(2));
insert into t2 values ('a','b'), ('c', 'd'); insert into t2 values ('a','b'), ('c', 'd');
select * from t1 where (a1, a2) NOT IN (select b1, b2 from t2); select * from t1 where (a1, a2) NOT IN (select b1, b2 from t2);
drop table t1,t2; drop table t1,t2;
set @@optimizer_switch=@save_optimizer_switch;
--echo # --echo #
...@@ -32,20 +32,17 @@ CREATE TABLE t2 (b1 int DEFAULT NULL, b2 int DEFAULT NULL); ...@@ -32,20 +32,17 @@ CREATE TABLE t2 (b1 int DEFAULT NULL, b2 int DEFAULT NULL);
INSERT INTO t2 VALUES (6,NULL); INSERT INTO t2 VALUES (6,NULL);
INSERT INTO t2 VALUES (NULL,0); INSERT INTO t2 VALUES (NULL,0);
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on'; set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on';
EXPLAIN EXTENDED EXPLAIN EXTENDED
SELECT * FROM (SELECT * FROM t1 WHERE a1 NOT IN (SELECT b2 FROM t2)) table1; SELECT * FROM (SELECT * FROM t1 WHERE a1 NOT IN (SELECT b2 FROM t2)) table1;
DROP TABLE t1, t2; DROP TABLE t1, t2;
set @@optimizer_switch=@save_optimizer_switch;
--echo # --echo #
--echo # LP BUG#613009 Crash in Ordered_key::get_field_idx --echo # LP BUG#613009 Crash in Ordered_key::get_field_idx
--echo # --echo #
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off'; set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off';
create table t1 (a1 char(3) DEFAULT NULL, a2 char(3) DEFAULT NULL); create table t1 (a1 char(3) DEFAULT NULL, a2 char(3) DEFAULT NULL);
...@@ -53,7 +50,6 @@ insert into t1 values (NULL, 'a21'), (NULL, 'a22'); ...@@ -53,7 +50,6 @@ insert into t1 values (NULL, 'a21'), (NULL, 'a22');
explain select * from t1 where (a1, a2) not in (select a1, a2 from t1); explain select * from t1 where (a1, a2) not in (select a1, a2 from t1);
select * from t1 where (a1, a2) not in (select a1, a2 from t1); select * from t1 where (a1, a2) not in (select a1, a2 from t1);
drop table t1; drop table t1;
set @@optimizer_switch=@save_optimizer_switch;
--echo # --echo #
--echo # LP BUG#680058 void Ordered_key::add_key(rownum_t): --echo # LP BUG#680058 void Ordered_key::add_key(rownum_t):
...@@ -65,8 +61,84 @@ insert into t1 values ('t', '0'), ('0', 't'); ...@@ -65,8 +61,84 @@ insert into t1 values ('t', '0'), ('0', 't');
create table t2 (f3 char(1), f4 char(1)); create table t2 (f3 char(1), f4 char(1));
insert into t2 values ('t', NULL), ('t', NULL), ('d', 'y'); insert into t2 values ('t', NULL), ('t', NULL), ('d', 'y');
set @save_optimizer_switch=@@optimizer_switch; set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,semijoin=off';
SET @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,semijoin=off';
select * from t1 where (f1, f2) not in (select * from t2); select * from t1 where (f1, f2) not in (select * from t2);
set @@optimizer_switch=@save_optimizer_switch;
drop table t1, t2; drop table t1, t2;
--echo #
--echo # LP BUG#809245 Second assertion `bit < (map)->n_bits' with partial_match_merge
--echo #
CREATE TABLE t1 (d varchar(32)) ;
INSERT INTO t1 VALUES ('r');
CREATE TABLE t2 ( a int, c varchar(32)) ;
INSERT INTO t2 VALUES (5,'r');
CREATE TABLE t3 ( a int NOT NULL , d varchar(32)) ;
INSERT INTO t3 VALUES (10,'g');
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,in_to_exists=off';
EXPLAIN SELECT *
FROM t1
WHERE (t1.d , t1.d) NOT IN (
SELECT t3.d , t2.c
FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
SELECT *
FROM t1
WHERE (t1.d , t1.d) NOT IN (
SELECT t3.d , t2.c
FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
set @@optimizer_switch='materialization=off,in_to_exists=on';
EXPLAIN SELECT *
FROM t1
WHERE (t1.d , t1.d) NOT IN (
SELECT t3.d , t2.c
FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
SELECT *
FROM t1
WHERE (t1.d , t1.d) NOT IN (
SELECT t3.d , t2.c
FROM t3 LEFT JOIN t2 ON t3.a = t2.a);
drop table t1, t2, t3;
--echo #
--echo # LP BUG#809266 Diverging results with partial_match_rowid_merge=on
--echo #
CREATE TABLE t1 (c int) ;
INSERT INTO t1 VALUES (0),(0);
CREATE TABLE t2 (a int, b int) ;
INSERT INTO t2 VALUES (6,3), (9,NULL);
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,in_to_exists=off';
EXPLAIN
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
EXPLAIN
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
set @@optimizer_switch='materialization=off,in_to_exists=on';
EXPLAIN
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT b, a FROM t2);
EXPLAIN
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
SELECT * FROM t1 WHERE (6, 4 ) NOT IN (SELECT a, b FROM t2);
drop table t1, t2;
set @@optimizer_switch=@save_optimizer_switch;
sql/item_subselect.cc
View file @ c4097382
This diff is collapsed.
sql/item_subselect.h
View file @ c4097382
...@@ -1131,11 +1131,18 @@ protected: ...@@ -1131,11 +1131,18 @@ protected:
/* A list of equalities between each pair of IN operands. */ /* A list of equalities between each pair of IN operands. */
List<Item> *equi_join_conds; List<Item> *equi_join_conds;
/* /*
If there is a row, such that all its NULL-able components are NULL, this True if there is an all NULL row in tmp_table. If so, then if there is
member is set to the number of covered columns. If there is no covering no complete match, there is a guaranteed partial match.
row, then this is 0.
*/ */
uint covering_null_row_width; bool has_covering_null_row;
/*
True if all nullable columns of tmp_table consist of only NULL values.
If so, then if there is a match in the non-null columns, there is a
guaranteed partial match.
*/
bool has_covering_null_columns;
protected: protected:
virtual bool partial_match()= 0; virtual bool partial_match()= 0;
public: public:
...@@ -1144,7 +1151,8 @@ public: ...@@ -1144,7 +1151,8 @@ public:
TABLE *tmp_table_arg, Item_subselect *item_arg, TABLE *tmp_table_arg, Item_subselect *item_arg,
select_result_interceptor *result_arg, select_result_interceptor *result_arg,
List<Item> *equi_join_conds_arg, List<Item> *equi_join_conds_arg,
uint covering_null_row_width_arg); bool has_covering_null_row_arg,
bool has_covering_null_columns_arg);
int prepare() { return 0; } int prepare() { return 0; }
int exec(); int exec();
void fix_length_and_dec(Item_cache**) {} void fix_length_and_dec(Item_cache**) {}
...@@ -1191,11 +1199,6 @@ protected: ...@@ -1191,11 +1199,6 @@ protected:
outer reference. outer reference.
*/ */
MY_BITMAP matching_outer_cols; MY_BITMAP matching_outer_cols;
/*
Columns that consist of only NULLs. Such columns match any value.
Computed once per query execution.
*/
MY_BITMAP null_only_columns;
/* /*
Indexes of row numbers, sorted by <column_value, row_number>. If an Indexes of row numbers, sorted by <column_value, row_number>. If an
index may contain NULLs, the NULLs are stored efficiently in a bitmap. index may contain NULLs, the NULLs are stored efficiently in a bitmap.
...@@ -1205,13 +1208,13 @@ protected: ...@@ -1205,13 +1208,13 @@ protected:
non-NULL columns, it is contained in keys[0]. non-NULL columns, it is contained in keys[0].
*/ */
Ordered_key **merge_keys; Ordered_key **merge_keys;
/* The number of elements in keys. */ /* The number of elements in merge_keys. */
uint keys_count; uint merge_keys_count;
/* /*
An index on all non-NULL columns of 'tmp_table'. The index has the An index on all non-NULL columns of 'tmp_table'. The index has the
logical form: <[v_i1 | ... | v_ik], rownum>. It allows to find the row logical form: <[v_i1 | ... | v_ik], rownum>. It allows to find the row
number where the columns c_i1,...,c1_k contain the values v_i1,...,v_ik. number where the columns c_i1,...,c1_k contain the values v_i1,...,v_ik.
If such an index exists, it is always the first element of 'keys'. If such an index exists, it is always the first element of 'merge_keys'.
*/ */
Ordered_key *non_null_key; Ordered_key *non_null_key;
/* /*
...@@ -1236,15 +1239,17 @@ protected: ...@@ -1236,15 +1239,17 @@ protected:
public: public:
subselect_rowid_merge_engine(THD *thd_arg, subselect_rowid_merge_engine(THD *thd_arg,
subselect_uniquesubquery_engine *engine_arg, subselect_uniquesubquery_engine *engine_arg,
TABLE *tmp_table_arg, uint keys_count_arg, TABLE *tmp_table_arg, uint merge_keys_count_arg,
uint covering_null_row_width_arg, bool has_covering_null_row_arg,
bool has_covering_null_columns_arg,
Item_subselect *item_arg, Item_subselect *item_arg,
select_result_interceptor *result_arg, select_result_interceptor *result_arg,
List<Item> *equi_join_conds_arg) List<Item> *equi_join_conds_arg)
:subselect_partial_match_engine(thd_arg, engine_arg, tmp_table_arg, :subselect_partial_match_engine(thd_arg, engine_arg, tmp_table_arg,
item_arg, result_arg, equi_join_conds_arg, item_arg, result_arg, equi_join_conds_arg,
covering_null_row_width_arg), has_covering_null_row_arg,
keys_count(keys_count_arg), non_null_key(NULL) has_covering_null_columns_arg),
merge_keys_count(merge_keys_count_arg), non_null_key(NULL)
{} {}
~subselect_rowid_merge_engine(); ~subselect_rowid_merge_engine();
bool init(MY_BITMAP *non_null_key_parts, MY_BITMAP *partial_match_key_parts); bool init(MY_BITMAP *non_null_key_parts, MY_BITMAP *partial_match_key_parts);
...@@ -1263,7 +1268,8 @@ public: ...@@ -1263,7 +1268,8 @@ public:
TABLE *tmp_table_arg, Item_subselect *item_arg, TABLE *tmp_table_arg, Item_subselect *item_arg,
select_result_interceptor *result_arg, select_result_interceptor *result_arg,
List<Item> *equi_join_conds_arg, List<Item> *equi_join_conds_arg,
uint covering_null_row_width_arg); bool has_covering_null_row_arg,
bool has_covering_null_columns_arg);
void cleanup(); void cleanup();
virtual enum_engine_type engine_type() { return TABLE_SCAN_ENGINE; } virtual enum_engine_type engine_type() { return TABLE_SCAN_ENGINE; }
}; };
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