Sergey, Nice test case.
Would you mind cleaning up the end-space in your patch? Also, is there a reason to put the entire body of Mrr_ordered_index_reader::resume_read in the if() instead of an early return? Regards, Jeremy On Thu, Oct 16, 2014 at 11:58 AM, Sergey Petrunya <[email protected]> wrote: > At file:///home/psergey/dev2/10.0/ > > ------------------------------------------------------------ > revno: 4445 > revision-id: [email protected] > parent: [email protected] > committer: Sergey Petrunya <[email protected]> > branch nick: 10.0 > timestamp: Thu 2014-10-16 17:57:13 +0400 > message: > MDEV-6878: Use of uninitialized saved_primary_key in > Mrr_ordered_index_reader::resume_read() > > - Make Mrr_ordered_index_reader::resume_read() restore index position > only if it was saved before with > Mrr_ordered_index_reader::interrupt_read(). > === modified file 'mysql-test/r/innodb_mrr_cpk.result' > --- a/mysql-test/r/innodb_mrr_cpk.result 2013-09-26 18:20:15 +0000 > +++ b/mysql-test/r/innodb_mrr_cpk.result 2014-10-16 13:57:13 +0000 > @@ -194,3 +194,41 @@ id select_type table type possible_keys > 2 DERIVED t2 ALL NULL NULL NULL NULL # > set join_cache_level= @tmp_mdev5037; > drop table t0,t1,t2; > +# > +# MDEV-6878: Use of uninitialized saved_primary_key in > Mrr_ordered_index_reader::resume_read() > +# > +create table t0(a int); > +insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); > +create table t1 ( > +pk varchar(32) character set utf8 primary key, > +kp1 char(32) not null, > +col1 varchar(32), > +key (kp1) > +) engine=innodb; > +insert into t1 > +select > +concat('pk-', 1000 +A.a), > +concat('kp1-', 1000 +A.a), > +concat('val-', 1000 +A.a) > +from test.t0 A ; > +create table t2 as select kp1 as a from t1; > +set join_cache_level=8; > +set optimizer_switch='mrr=on,mrr_sort_keys=on'; > +explain > +select * from t2 straight_join t1 force index(kp1) where t1.kp1=t2.a; > +id select_type table type possible_keys key key_len > ref rows Extra > +1 SIMPLE t2 ALL NULL NULL NULL NULL 10 > +1 SIMPLE t1 ref kp1 kp1 32 test.t2.a 1 > Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan > +select * from t2 straight_join t1 force index(kp1) where t1.kp1=t2.a; > +a pk kp1 col1 > +kp1-1000 pk-1000 kp1-1000 val-1000 > +kp1-1001 pk-1001 kp1-1001 val-1001 > +kp1-1002 pk-1002 kp1-1002 val-1002 > +kp1-1003 pk-1003 kp1-1003 val-1003 > +kp1-1004 pk-1004 kp1-1004 val-1004 > +kp1-1005 pk-1005 kp1-1005 val-1005 > +kp1-1006 pk-1006 kp1-1006 val-1006 > +kp1-1007 pk-1007 kp1-1007 val-1007 > +kp1-1008 pk-1008 kp1-1008 val-1008 > +kp1-1009 pk-1009 kp1-1009 val-1009 > +drop table t0,t1,t2; > > === modified file 'mysql-test/t/innodb_mrr_cpk.test' > --- a/mysql-test/t/innodb_mrr_cpk.test 2013-09-26 18:20:15 +0000 > +++ b/mysql-test/t/innodb_mrr_cpk.test 2014-10-16 13:57:13 +0000 > @@ -192,3 +192,35 @@ explain SELECT 1 FROM (SELECT url, id FR > set join_cache_level= @tmp_mdev5037; > > drop table t0,t1,t2; > + > +--echo # > +--echo # MDEV-6878: Use of uninitialized saved_primary_key in > Mrr_ordered_index_reader::resume_read() > +--echo # > +create table t0(a int); > +insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); > + > +create table t1 ( > + pk varchar(32) character set utf8 primary key, > + kp1 char(32) not null, > + col1 varchar(32), > + key (kp1) > +) engine=innodb; > + > +insert into t1 > +select > + concat('pk-', 1000 +A.a), > + concat('kp1-', 1000 +A.a), > + concat('val-', 1000 +A.a) > +from test.t0 A ; > + > +create table t2 as select kp1 as a from t1; > + > +set join_cache_level=8; > +set optimizer_switch='mrr=on,mrr_sort_keys=on'; > +explain > +select * from t2 straight_join t1 force index(kp1) where t1.kp1=t2.a; > +select * from t2 straight_join t1 force index(kp1) where t1.kp1=t2.a; > + > +drop table t0,t1,t2; > + > + > > === modified file 'sql/multi_range_read.cc' > --- a/sql/multi_range_read.cc 2014-06-06 17:28:42 +0000 > +++ b/sql/multi_range_read.cc 2014-10-16 13:57:13 +0000 > @@ -426,6 +426,7 @@ bool Mrr_ordered_index_reader::set_inter > *space_start += key_len; > > have_saved_rowid= FALSE; > + read_was_interrupted= FALSE; > return FALSE; > } > > @@ -434,6 +435,7 @@ void Mrr_ordered_index_reader::set_no_in > support_scan_interruptions= FALSE; > saved_key_tuple= saved_rowid= saved_primary_key= NULL; /* safety */ > have_saved_rowid= FALSE; > + read_was_interrupted= FALSE; > } > > void Mrr_ordered_index_reader::interrupt_read() > @@ -451,6 +453,7 @@ void Mrr_ordered_index_reader::interrupt > &table->key_info[table->s->primary_key], > table->key_info[table->s->primary_key].key_length); > } > + read_was_interrupted= TRUE; > > /* Save the last rowid */ > memcpy(saved_rowid, file->ref, file->ref_length); > @@ -468,14 +471,17 @@ void Mrr_ordered_index_reader::position( > void Mrr_ordered_index_reader::resume_read() > { > TABLE *table= file->get_table(); > - KEY *used_index= &table->key_info[file->active_index]; > - key_restore(table->record[0], saved_key_tuple, > - used_index, used_index->key_length); > - if (saved_primary_key) > + if (read_was_interrupted) > { > - key_restore(table->record[0], saved_primary_key, > - &table->key_info[table->s->primary_key], > - table->key_info[table->s->primary_key].key_length); > + KEY *used_index= &table->key_info[file->active_index]; > + key_restore(table->record[0], saved_key_tuple, > + used_index, used_index->key_length); > + if (saved_primary_key) > + { > + key_restore(table->record[0], saved_primary_key, > + &table->key_info[table->s->primary_key], > + table->key_info[table->s->primary_key].key_length); > + } > } > } > > @@ -557,8 +563,7 @@ int Mrr_ordered_index_reader::init(handl > is_mrr_assoc= !MY_TEST(mode & HA_MRR_NO_ASSOCIATION); > mrr_funcs= *seq_funcs; > source_exhausted= FALSE; > - if (support_scan_interruptions) > - bzero(saved_key_tuple, key_info->key_length); > + read_was_interrupted= false; > have_saved_rowid= FALSE; > return 0; > } > > === modified file 'sql/multi_range_read.h' > --- a/sql/multi_range_read.h 2013-09-26 18:20:15 +0000 > +++ b/sql/multi_range_read.h 2014-10-16 13:57:13 +0000 > @@ -339,6 +339,12 @@ class Mrr_ordered_index_reader : public > > uchar *saved_key_tuple; /* Saved current key tuple */ > uchar *saved_primary_key; /* Saved current primary key tuple */ > + > + /* > + TRUE<=> saved_key_tuple (and saved_primary_key when applicable) have > + valid values. > + */ > + bool read_was_interrupted; > > static int compare_keys(void* arg, uchar* key1, uchar* key2); > static int compare_keys_reverse(void* arg, uchar* key1, uchar* key2); > > _______________________________________________ > commits mailing list > [email protected] > https://lists.askmonty.org/cgi-bin/mailman/listinfo/commits >
_______________________________________________ Mailing list: https://launchpad.net/~maria-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~maria-developers More help : https://help.launchpad.net/ListHelp
