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MDEV-18799 Long unique does not work after failed alter table

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Restore table->key_info after calling setup_keyinfo_hash in
mysql_prepare_alter_table.
This commit is contained in:
sachin
2019-03-03 17:56:48 +05:30
committed by sachinsetia1001@gmail.com
parent c3cfcd5b5e
commit 560598c9b2
4 changed files with 43 additions and 4 deletions
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21
mysql-test/main/long_unique_bugs.result
View File

@ -63,3 +63,24 @@ ALTER TABLE t1 DROP x, ALGORITHM=INPLACE;
ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY
UPDATE t1 SET x = 'bar';
DROP TABLE t1;
create table t1(a blob unique , b blob);
insert into t1 values(1,1),(2,1);
alter table t1 add unique(b);
ERROR 23000: Duplicate entry '1' for key 'b'
show keys from t1;;
Table t1
Non_unique 0
Key_name a
Seq_in_index 1
Column_name a
Collation A
Cardinality NULL
Sub_part NULL
Packed NULL
Null YES
Index_type HASH
Comment
Index_comment
insert into t1 values(1,1);
ERROR 23000: Duplicate entry '1' for key 'a'
DROP TABLE t1;

12
mysql-test/main/long_unique_bugs.test
View File

@ -82,3 +82,15 @@ INSERT INTO t1 VALUES (1,'foo');
ALTER TABLE t1 DROP x, ALGORITHM=INPLACE;
UPDATE t1 SET x = 'bar';
DROP TABLE t1;
#
# MDEV-18799 Long unique does not work after failed alter table
#
create table t1(a blob unique , b blob);
insert into t1 values(1,1),(2,1);
--error ER_DUP_ENTRY
alter table t1 add unique(b);
--query_vertical show keys from t1;
--error ER_DUP_ENTRY
insert into t1 values(1,1);
DROP TABLE t1;

12
sql/sql_table.cc
View File

@ -8299,10 +8299,14 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
*/
for (uint i=0 ; i < table->s->keys ; i++,key_info++)
{
bool long_hash_key= false;
if (key_info->flags & HA_INVISIBLE_KEY)
continue;
if (key_info->algorithm == HA_KEY_ALG_LONG_HASH)
{
setup_keyinfo_hash(key_info);
long_hash_key= true;
}
const char *key_name= key_info->name.str;
Alter_drop *drop;
drop_it.rewind();
@ -8427,10 +8431,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
LEX_CSTRING tmp_name;
bzero((char*) &key_create_info, sizeof(key_create_info));
if (key_info->algorithm == HA_KEY_ALG_LONG_HASH)
{
key_info->flags|= HA_NOSAME;
key_info->algorithm= HA_KEY_ALG_UNDEF;
}
key_create_info.algorithm= key_info->algorithm;
/*
We copy block size directly as some engines, like Area, sets this
@ -8476,8 +8477,11 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
&key_parts, key_info->option_list, DDL_options());
new_key_list.push_back(key, thd->mem_root);
}
if (key_info->algorithm == HA_KEY_ALG_LONG_HASH)
if (long_hash_key)
{
key_info->algorithm= HA_KEY_ALG_LONG_HASH;
re_setup_keyinfo_hash(key_info);
}
}
{
Key *key;

2
sql/table.cc
View File

@ -8983,6 +8983,7 @@ void setup_keyinfo_hash(KEY *key_info)
key_info->key_part-= no_of_keyparts;
key_info->user_defined_key_parts= key_info->usable_key_parts=
key_info->ext_key_parts= no_of_keyparts;
key_info->flags|= HA_NOSAME;
}
/*
re_setup_keyinfo_hash reverts th setup_keyinfo_hash and this type of
@ -8997,6 +8998,7 @@ void re_setup_keyinfo_hash(KEY *key_info)
key_info->key_part++;
key_info->user_defined_key_parts= key_info->usable_key_parts=
key_info->ext_key_parts= 1;
key_info->flags&= ~HA_NOSAME;
}
/**
@brief clone of current handler.