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BUG#830993: Crash in end_read_record with derived table

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- Let join buffering code correctly take into account rowids needed 
  by DuplicateElimination when it is calculating minimum record sizes.
- In JOIN_CACHE::write_record_data, added asserts that prevent us from 
  writing beyond the end of the buffer.
This commit is contained in:
Sergey Petrunya 2011-09-08 19:48:14 +04:00
parent 528598c478
commit 5673aa41c3
6 changed files with 268 additions and 19 deletions
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80
mysql-test/r/subselect_sj.result
View File

@ -1811,4 +1811,84 @@ a
0 0
DROP TABLE t2, t3, t4, t5; DROP TABLE t2, t3, t4, t5;
set @@optimizer_switch=@tmp834739; set @@optimizer_switch=@tmp834739;
#
# BUG#830993: Crash in end_read_record with derived table
#
set @tmp_830993=@@optimizer_switch;
set optimizer_switch='semijoin=on,loosescan=off,materialization=off,firstmatch=off';
set @tmp_830993_jbs= @@join_buffer_size;
set join_buffer_size=160;
CREATE TABLE t1 (
a int(11) NOT NULL AUTO_INCREMENT,
b int(11) DEFAULT NULL,
c int(11) DEFAULT NULL,
d time DEFAULT NULL,
e varchar(1) DEFAULT NULL,
f varchar(1) DEFAULT NULL,
PRIMARY KEY (a),
KEY c (c),
KEY d (d),
KEY e (e,c)
);
INSERT INTO t1 VALUES (10,NULL,8,'22:55:23','x','x'),
(11,8,7,'10:19:31','d','d'),(12,1,1,'14:40:36','r','r'),
(13,9,7,'04:37:47','f','f'),(14,4,9,'19:34:06','y','y'),
(15,3,NULL,'20:35:33','u','u'),(16,2,1,NULL,'m','m'),
(17,NULL,9,'14:43:37',NULL,NULL),(18,2,2,'02:23:09','o','o'),
(19,NULL,9,'01:22:45','w','w'),(20,6,2,'00:00:00','m','m'),
(21,7,4,'00:13:25','q','q'),(22,2,0,'03:47:16',NULL,NULL),
(23,5,4,'01:41:48','d','d'),(24,7,8,'00:00:00','g','g'),
(25,6,NULL,'22:32:04','x','x'),(26,6,NULL,'16:44:14','f','f'),
(27,2,0,'17:38:37','p','p'),(28,9,NULL,'08:46:48','j','j'),
(29,6,8,'14:11:27','c','c');
CREATE TABLE t2 like t1;
INSERT INTO t2 VALUES (1,2,4,'22:34:09','v','v'),
(2,150,62,'14:26:02','v','v'),(3,NULL,7,'14:03:03','c','c'),
(4,2,1,'01:46:09',NULL,NULL),(5,5,0,'16:21:18','x','x'),
(6,3,7,'18:56:33','i','i'),(7,1,7,NULL,'e','e'),
(8,4,1,'09:29:08','p','p'),(9,NULL,7,'19:11:10','s','s'),
(10,2,1,'11:57:26','j','j'),(11,6,5,'00:39:46','z','z'),
(12,6,2,'03:28:15','c','c'),(13,8,0,'06:44:18','a','a'),
(14,2,1,'14:36:39','q','q'),(15,6,8,'18:42:45','y','y'),
(16,8,1,'02:57:29',NULL,NULL),(17,3,1,'16:46:13','r','r'),
(18,3,9,'19:39:02','v','v'),(19,9,1,NULL,NULL,NULL),
(20,6,5,'20:58:33','r','r');
explain
SELECT
alias1.a, alias1.b, alias1.c, alias1.d, alias1.e, alias1.f,
alias2.a as a2_a, alias2.b as a2_b, alias2.c as a2_c, alias2.d as a2_d,
alias2.e as a2_e, alias2.f as a2_f,
t2.a as t2_a, t2.b as t2_b, t2.c as t2_c, t2.d as t2_d, t2.e as t2_e, t2.f as t2_f
FROM
(SELECT * FROM t2) AS alias1,
t1 AS alias2,
t2
WHERE
alias1.c IN (SELECT SQ3_alias1.b
FROM t2 AS SQ3_alias1 STRAIGHT_JOIN t2 AS SQ3_alias2)
LIMIT 100;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 20 Start temporary
1 PRIMARY alias2 ALL NULL NULL NULL NULL 20 Using join buffer (flat, BNL join)
1 PRIMARY t2 ALL NULL NULL NULL NULL 20 Using join buffer (flat, BNL join)
1 PRIMARY SQ3_alias1 ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join)
1 PRIMARY SQ3_alias2 index NULL PRIMARY 4 NULL 20 Using index; End temporary; Using join buffer (flat, BNL join)
2 DERIVED t2 ALL NULL NULL NULL NULL 20
create table t3 as
SELECT
alias1.a, alias1.b, alias1.c, alias1.d, alias1.e, alias1.f,
alias2.a as a2_a, alias2.b as a2_b, alias2.c as a2_c, alias2.d as a2_d,
alias2.e as a2_e, alias2.f as a2_f,
t2.a as t2_a, t2.b as t2_b, t2.c as t2_c, t2.d as t2_d, t2.e as t2_e, t2.f as t2_f
FROM
(SELECT * FROM t2) AS alias1,
t1 AS alias2,
t2
WHERE
alias1.c IN (SELECT SQ3_alias1.b
FROM t2 AS SQ3_alias1 STRAIGHT_JOIN t2 AS SQ3_alias2)
LIMIT 100;
drop table t1,t2, t3;
set optimizer_switch=@tmp_830993;
set join_buffer_size= @tmp_830993_jbs;
set optimizer_switch=@subselect_sj_tmp; set optimizer_switch=@subselect_sj_tmp;

80
mysql-test/r/subselect_sj_jcl6.result
View File

@ -1822,6 +1822,86 @@ a
0 0
DROP TABLE t2, t3, t4, t5; DROP TABLE t2, t3, t4, t5;
set @@optimizer_switch=@tmp834739; set @@optimizer_switch=@tmp834739;
#
# BUG#830993: Crash in end_read_record with derived table
#
set @tmp_830993=@@optimizer_switch;
set optimizer_switch='semijoin=on,loosescan=off,materialization=off,firstmatch=off';
set @tmp_830993_jbs= @@join_buffer_size;
set join_buffer_size=160;
CREATE TABLE t1 (
a int(11) NOT NULL AUTO_INCREMENT,
b int(11) DEFAULT NULL,
c int(11) DEFAULT NULL,
d time DEFAULT NULL,
e varchar(1) DEFAULT NULL,
f varchar(1) DEFAULT NULL,
PRIMARY KEY (a),
KEY c (c),
KEY d (d),
KEY e (e,c)
);
INSERT INTO t1 VALUES (10,NULL,8,'22:55:23','x','x'),
(11,8,7,'10:19:31','d','d'),(12,1,1,'14:40:36','r','r'),
(13,9,7,'04:37:47','f','f'),(14,4,9,'19:34:06','y','y'),
(15,3,NULL,'20:35:33','u','u'),(16,2,1,NULL,'m','m'),
(17,NULL,9,'14:43:37',NULL,NULL),(18,2,2,'02:23:09','o','o'),
(19,NULL,9,'01:22:45','w','w'),(20,6,2,'00:00:00','m','m'),
(21,7,4,'00:13:25','q','q'),(22,2,0,'03:47:16',NULL,NULL),
(23,5,4,'01:41:48','d','d'),(24,7,8,'00:00:00','g','g'),
(25,6,NULL,'22:32:04','x','x'),(26,6,NULL,'16:44:14','f','f'),
(27,2,0,'17:38:37','p','p'),(28,9,NULL,'08:46:48','j','j'),
(29,6,8,'14:11:27','c','c');
CREATE TABLE t2 like t1;
INSERT INTO t2 VALUES (1,2,4,'22:34:09','v','v'),
(2,150,62,'14:26:02','v','v'),(3,NULL,7,'14:03:03','c','c'),
(4,2,1,'01:46:09',NULL,NULL),(5,5,0,'16:21:18','x','x'),
(6,3,7,'18:56:33','i','i'),(7,1,7,NULL,'e','e'),
(8,4,1,'09:29:08','p','p'),(9,NULL,7,'19:11:10','s','s'),
(10,2,1,'11:57:26','j','j'),(11,6,5,'00:39:46','z','z'),
(12,6,2,'03:28:15','c','c'),(13,8,0,'06:44:18','a','a'),
(14,2,1,'14:36:39','q','q'),(15,6,8,'18:42:45','y','y'),
(16,8,1,'02:57:29',NULL,NULL),(17,3,1,'16:46:13','r','r'),
(18,3,9,'19:39:02','v','v'),(19,9,1,NULL,NULL,NULL),
(20,6,5,'20:58:33','r','r');
explain
SELECT
alias1.a, alias1.b, alias1.c, alias1.d, alias1.e, alias1.f,
alias2.a as a2_a, alias2.b as a2_b, alias2.c as a2_c, alias2.d as a2_d,
alias2.e as a2_e, alias2.f as a2_f,
t2.a as t2_a, t2.b as t2_b, t2.c as t2_c, t2.d as t2_d, t2.e as t2_e, t2.f as t2_f
FROM
(SELECT * FROM t2) AS alias1,
t1 AS alias2,
t2
WHERE
alias1.c IN (SELECT SQ3_alias1.b
FROM t2 AS SQ3_alias1 STRAIGHT_JOIN t2 AS SQ3_alias2)
LIMIT 100;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 20 Start temporary
1 PRIMARY alias2 ALL NULL NULL NULL NULL 20 Using join buffer (flat, BNL join)
1 PRIMARY t2 ALL NULL NULL NULL NULL 20 Using join buffer (incremental, BNL join)
1 PRIMARY SQ3_alias1 ALL NULL NULL NULL NULL 20 Using where; Using join buffer (incremental, BNL join)
1 PRIMARY SQ3_alias2 index NULL PRIMARY 4 NULL 20 Using index; End temporary; Using join buffer (incremental, BNL join)
2 DERIVED t2 ALL NULL NULL NULL NULL 20
create table t3 as
SELECT
alias1.a, alias1.b, alias1.c, alias1.d, alias1.e, alias1.f,
alias2.a as a2_a, alias2.b as a2_b, alias2.c as a2_c, alias2.d as a2_d,
alias2.e as a2_e, alias2.f as a2_f,
t2.a as t2_a, t2.b as t2_b, t2.c as t2_c, t2.d as t2_d, t2.e as t2_e, t2.f as t2_f
FROM
(SELECT * FROM t2) AS alias1,
t1 AS alias2,
t2
WHERE
alias1.c IN (SELECT SQ3_alias1.b
FROM t2 AS SQ3_alias1 STRAIGHT_JOIN t2 AS SQ3_alias2)
LIMIT 100;
drop table t1,t2, t3;
set optimizer_switch=@tmp_830993;
set join_buffer_size= @tmp_830993_jbs;
set optimizer_switch=@subselect_sj_tmp; set optimizer_switch=@subselect_sj_tmp;
# #
# BUG#49129: Wrong result with IN-subquery with join_cache_level=6 and firstmatch=off # BUG#49129: Wrong result with IN-subquery with join_cache_level=6 and firstmatch=off

80
mysql-test/t/subselect_sj.test
View File

@ -1642,5 +1642,85 @@ SELECT * FROM t3 WHERE t3.a IN (SELECT t5.a FROM t2, t4, t5 WHERE t2.c = t5.a AN
DROP TABLE t2, t3, t4, t5; DROP TABLE t2, t3, t4, t5;
set @@optimizer_switch=@tmp834739; set @@optimizer_switch=@tmp834739;
--echo #
--echo # BUG#830993: Crash in end_read_record with derived table
--echo #
set @tmp_830993=@@optimizer_switch;
set optimizer_switch='semijoin=on,loosescan=off,materialization=off,firstmatch=off';
set @tmp_830993_jbs= @@join_buffer_size;
--disable_warnings
set join_buffer_size=160;
--enable_warnings
CREATE TABLE t1 (
a int(11) NOT NULL AUTO_INCREMENT,
b int(11) DEFAULT NULL,
c int(11) DEFAULT NULL,
d time DEFAULT NULL,
e varchar(1) DEFAULT NULL,
f varchar(1) DEFAULT NULL,
PRIMARY KEY (a),
KEY c (c),
KEY d (d),
KEY e (e,c)
);
INSERT INTO t1 VALUES (10,NULL,8,'22:55:23','x','x'),
(11,8,7,'10:19:31','d','d'),(12,1,1,'14:40:36','r','r'),
(13,9,7,'04:37:47','f','f'),(14,4,9,'19:34:06','y','y'),
(15,3,NULL,'20:35:33','u','u'),(16,2,1,NULL,'m','m'),
(17,NULL,9,'14:43:37',NULL,NULL),(18,2,2,'02:23:09','o','o'),
(19,NULL,9,'01:22:45','w','w'),(20,6,2,'00:00:00','m','m'),
(21,7,4,'00:13:25','q','q'),(22,2,0,'03:47:16',NULL,NULL),
(23,5,4,'01:41:48','d','d'),(24,7,8,'00:00:00','g','g'),
(25,6,NULL,'22:32:04','x','x'),(26,6,NULL,'16:44:14','f','f'),
(27,2,0,'17:38:37','p','p'),(28,9,NULL,'08:46:48','j','j'),
(29,6,8,'14:11:27','c','c');
CREATE TABLE t2 like t1;
INSERT INTO t2 VALUES (1,2,4,'22:34:09','v','v'),
(2,150,62,'14:26:02','v','v'),(3,NULL,7,'14:03:03','c','c'),
(4,2,1,'01:46:09',NULL,NULL),(5,5,0,'16:21:18','x','x'),
(6,3,7,'18:56:33','i','i'),(7,1,7,NULL,'e','e'),
(8,4,1,'09:29:08','p','p'),(9,NULL,7,'19:11:10','s','s'),
(10,2,1,'11:57:26','j','j'),(11,6,5,'00:39:46','z','z'),
(12,6,2,'03:28:15','c','c'),(13,8,0,'06:44:18','a','a'),
(14,2,1,'14:36:39','q','q'),(15,6,8,'18:42:45','y','y'),
(16,8,1,'02:57:29',NULL,NULL),(17,3,1,'16:46:13','r','r'),
(18,3,9,'19:39:02','v','v'),(19,9,1,NULL,NULL,NULL),
(20,6,5,'20:58:33','r','r');
explain
SELECT
alias1.a, alias1.b, alias1.c, alias1.d, alias1.e, alias1.f,
alias2.a as a2_a, alias2.b as a2_b, alias2.c as a2_c, alias2.d as a2_d,
alias2.e as a2_e, alias2.f as a2_f,
t2.a as t2_a, t2.b as t2_b, t2.c as t2_c, t2.d as t2_d, t2.e as t2_e, t2.f as t2_f
FROM
(SELECT * FROM t2) AS alias1,
t1 AS alias2,
t2
WHERE
alias1.c IN (SELECT SQ3_alias1.b
FROM t2 AS SQ3_alias1 STRAIGHT_JOIN t2 AS SQ3_alias2)
LIMIT 100;
create table t3 as
SELECT
alias1.a, alias1.b, alias1.c, alias1.d, alias1.e, alias1.f,
alias2.a as a2_a, alias2.b as a2_b, alias2.c as a2_c, alias2.d as a2_d,
alias2.e as a2_e, alias2.f as a2_f,
t2.a as t2_a, t2.b as t2_b, t2.c as t2_c, t2.d as t2_d, t2.e as t2_e, t2.f as t2_f
FROM
(SELECT * FROM t2) AS alias1,
t1 AS alias2,
t2
WHERE
alias1.c IN (SELECT SQ3_alias1.b
FROM t2 AS SQ3_alias1 STRAIGHT_JOIN t2 AS SQ3_alias2)
LIMIT 100;
drop table t1,t2, t3;
set optimizer_switch=@tmp_830993;
set join_buffer_size= @tmp_830993_jbs;
# The following command must be the last one the file # The following command must be the last one the file
set optimizer_switch=@subselect_sj_tmp; set optimizer_switch=@subselect_sj_tmp;

19
sql/sql_join_cache.cc
View File

@ -225,8 +225,6 @@ void JOIN_CACHE::calc_record_fields()
flag_fields+= test(tab->table->maybe_null); flag_fields+= test(tab->table->maybe_null);
fields+= tab->used_fields; fields+= tab->used_fields;
blobs+= tab->used_blobs; blobs+= tab->used_blobs;
fields+= tab->check_rowid_field();
} }
if ((with_match_flag= join_tab->use_match_flag())) if ((with_match_flag= join_tab->use_match_flag()))
flag_fields++; flag_fields++;
@ -620,7 +618,12 @@ void JOIN_CACHE::create_remaining_fields()
copy->type= CACHE_ROWID; copy->type= CACHE_ROWID;
copy->field= 0; copy->field= 0;
copy->referenced_field_no= 0; copy->referenced_field_no= 0;
length+= copy->length; /*
Note: this may seem odd, but at this point we have
table->file->ref==NULL while table->file->ref_length is already set
to correct value.
*/
length += table->file->ref_length;
data_field_count++; data_field_count++;
copy++; copy++;
} }
@ -1297,6 +1300,7 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
if (with_length) if (with_length)
{ {
rec_len_ptr= cp; rec_len_ptr= cp;
DBUG_ASSERT(cp + size_of_rec_len <= buff + buff_size);
cp+= size_of_rec_len; cp+= size_of_rec_len;
} }
@ -1306,6 +1310,7 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
*/ */
if (prev_cache) if (prev_cache)
{ {
DBUG_ASSERT(cp + prev_cache->get_size_of_rec_offset() <= buff + buff_size);
cp+= prev_cache->get_size_of_rec_offset(); cp+= prev_cache->get_size_of_rec_offset();
prev_cache->store_rec_ref(cp, link); prev_cache->store_rec_ref(cp, link);
} }
@ -1322,6 +1327,7 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
flags_pos= cp; flags_pos= cp;
for ( ; copy < copy_end; copy++) for ( ; copy < copy_end; copy++)
{ {
DBUG_ASSERT(cp + copy->length <= buff + buff_size);
memcpy(cp, copy->str, copy->length); memcpy(cp, copy->str, copy->length);
cp+= copy->length; cp+= copy->length;
} }
@ -1348,6 +1354,7 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
{ {
last_rec_blob_data_is_in_rec_buff= 1; last_rec_blob_data_is_in_rec_buff= 1;
/* Put down the length of the blob and the pointer to the data */ /* Put down the length of the blob and the pointer to the data */
DBUG_ASSERT(cp + copy->length + sizeof(char*) <= buff + buff_size);
blob_field->get_image(cp, copy->length+sizeof(char*), blob_field->get_image(cp, copy->length+sizeof(char*),
blob_field->charset()); blob_field->charset());
cp+= copy->length+sizeof(char*); cp+= copy->length+sizeof(char*);
@ -1357,6 +1364,7 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
/* First put down the length of the blob and then copy the data */ /* First put down the length of the blob and then copy the data */
blob_field->get_image(cp, copy->length, blob_field->get_image(cp, copy->length,
blob_field->charset()); blob_field->charset());
DBUG_ASSERT(cp + copy->length + copy->blob_length <= buff + buff_size);
memcpy(cp+copy->length, copy->str, copy->blob_length); memcpy(cp+copy->length, copy->str, copy->blob_length);
cp+= copy->length+copy->blob_length; cp+= copy->length+copy->blob_length;
} }
@ -1367,12 +1375,14 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
case CACHE_VARSTR1: case CACHE_VARSTR1:
/* Copy the significant part of the short varstring field */ /* Copy the significant part of the short varstring field */
len= (uint) copy->str[0] + 1; len= (uint) copy->str[0] + 1;
DBUG_ASSERT(cp + len <= buff + buff_size);
memcpy(cp, copy->str, len); memcpy(cp, copy->str, len);
cp+= len; cp+= len;
break; break;
case CACHE_VARSTR2: case CACHE_VARSTR2:
/* Copy the significant part of the long varstring field */ /* Copy the significant part of the long varstring field */
len= uint2korr(copy->str) + 2; len= uint2korr(copy->str) + 2;
DBUG_ASSERT(cp + len <= buff + buff_size);
memcpy(cp, copy->str, len); memcpy(cp, copy->str, len);
cp+= len; cp+= len;
break; break;
@ -1387,6 +1397,7 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
end > str && end[-1] == ' '; end > str && end[-1] == ' ';
end--) ; end--) ;
len=(uint) (end-str); len=(uint) (end-str);
DBUG_ASSERT(cp + len + 2 <= buff + buff_size);
int2store(cp, len); int2store(cp, len);
memcpy(cp+2, str, len); memcpy(cp+2, str, len);
cp+= len+2; cp+= len+2;
@ -1406,6 +1417,7 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
/* fall through */ /* fall through */
default: default:
/* Copy the entire image of the field from the record buffer */ /* Copy the entire image of the field from the record buffer */
DBUG_ASSERT(cp + copy->length <= buff + buff_size);
memcpy(cp, copy->str, copy->length); memcpy(cp, copy->str, copy->length);
cp+= copy->length; cp+= copy->length;
} }
@ -1425,6 +1437,7 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
cnt++; cnt++;
} }
} }
DBUG_ASSERT(cp + size_of_fld_ofs*cnt <= buff + buff_size);
cp+= size_of_fld_ofs*cnt; cp+= size_of_fld_ofs*cnt;
} }

18
sql/sql_select.cc
View File

@ -6572,6 +6572,16 @@ void JOIN_TAB::calc_used_field_length(bool max_fl)
rec_length+=(table->s->null_fields+7)/8; rec_length+=(table->s->null_fields+7)/8;
if (table->maybe_null) if (table->maybe_null)
rec_length+=sizeof(my_bool); rec_length+=sizeof(my_bool);
/* Take into account that DuplicateElimination may need to store rowid */
uint rowid_add_size= 0;
if (keep_current_rowid)
{
rowid_add_size= table->file->ref_length;
rec_length += rowid_add_size;
fields++;
}
if (max_fl) if (max_fl)
{ {
// TODO: to improve this estimate for max expected length // TODO: to improve this estimate for max expected length
@ -6585,13 +6595,9 @@ void JOIN_TAB::calc_used_field_length(bool max_fl)
} }
max_used_fieldlength= rec_length; max_used_fieldlength= rec_length;
} }
else if (table->file->stats.mean_rec_length) else if (table->file->stats.mean_rec_length)
set_if_smaller(rec_length, table->file->stats.mean_rec_length); set_if_smaller(rec_length, table->file->stats.mean_rec_length + rowid_add_size);
/*
TODO: why we don't count here rowid that we might need to store when
using DuplicateElimination?
*/
used_fields=fields; used_fields=fields;
used_fieldlength=rec_length; used_fieldlength=rec_length;
used_blobs=blobs; used_blobs=blobs;

10
sql/sql_select.h
View File

@ -288,7 +288,6 @@ typedef struct st_join_table {
ulong max_used_fieldlength; ulong max_used_fieldlength;
uint used_blobs; uint used_blobs;
uint used_null_fields; uint used_null_fields;
uint used_rowid_fields;
uint used_uneven_bit_fields; uint used_uneven_bit_fields;
enum join_type type; enum join_type type;
bool cached_eq_ref_table,eq_ref_table,not_used_in_distinct; bool cached_eq_ref_table,eq_ref_table,not_used_in_distinct;
@ -387,15 +386,6 @@ typedef struct st_join_table {
(select->quick->get_type() == (select->quick->get_type() ==
QUICK_SELECT_I::QS_TYPE_GROUP_MIN_MAX)); QUICK_SELECT_I::QS_TYPE_GROUP_MIN_MAX));
} }
bool check_rowid_field()
{
if (keep_current_rowid && !used_rowid_fields)
{
used_rowid_fields= 1;
used_fieldlength+= table->file->ref_length;
}
return test(used_rowid_fields);
}
bool is_inner_table_of_semi_join_with_first_match() bool is_inner_table_of_semi_join_with_first_match()
{ {
return first_sj_inner_tab != NULL; return first_sj_inner_tab != NULL;