2019-02-21 22:42:00 +01:00
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#
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# MDEV-371 Unique indexes for blobs
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#
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MDEV-371 Unique Index for long columns
This patch implements engine independent unique hash index.
Usage:- Unique HASH index can be created automatically for blob/varchar/test column whose key
length > handler->max_key_length()
or it can be explicitly specified.
Automatic Creation:-
Create TABLE t1 (a blob unique);
Explicit Creation:-
Create TABLE t1 (a int , unique(a) using HASH);
Internal KEY_PART Representations:-
Long unique key_info will have 2 representations.
(lets understand this with an example create table t1(a blob, b blob , unique(a, b)); )
1. User Given Representation:- key_info->key_part array will be similar to what user has defined.
So in case of example it will have 2 key_parts (a, b)
2. Storage Engine Representation:- In this case there will be only one key_part and it will point to
HASH_FIELD. This key_part will be always after user defined key_parts.
So:- User Given Representation [a] [b] [hash_key_part]
key_info->key_part ----^
Storage Engine Representation [a] [b] [hash_key_part]
key_info->key_part ------------^
Table->s->key_info will have User Given Representation, While table->key_info will have Storage Engine
Representation.Representation can be changed into each other by calling re/setup_keyinfo_hash function.
Working:-
1. So when user specifies HASH_INDEX or key_length is > handler->max_key_length(), In mysql_prepare_create_table
One extra vfield is added (for each long unique key). And key_info->algorithm is set to HA_KEY_ALG_LONG_HASH.
2. In init_from_binary_frm_image values for hash_keypart is set (like fieldnr , field and flags)
3. In parse_vcol_defs, HASH_FIELD->vcol_info is created. Item_func_hash is used with list of Item_fields,
When Explicit length is given by user then Item_left is used to concatenate Item_field values.
4. In ha_write_row/ha_update_row check_duplicate_long_entry_key is called which will create the hash key from
table->record[0] and then call ha_index_read_map , if we found duplicated hash , we will compare the result
field by field.
2019-02-19 22:23:08 +01:00
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--echo #structure of tests;
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--echo #1 test of table containing single unique blob column;
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--echo #2 test of table containing another unique int/ varchar etc column;
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--echo #3 test of table containing multiple unique blob column like unique(a),unique(b);
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--echo #4 test of table containing multiple multiple unique blob column like unique(a,b...),unique(c,d....);
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--echo #structure of each test;
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--echo #test if update works;
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--echo #test update for duplicate entry;
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--echo #test update for no change keys;
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--echo #test update for ignore ;
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--echo #test 1
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create table t1 (a blob unique);
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query_vertical show keys from t1;
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insert into t1 values(1),(2),(3),(4),(5);
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select * from t1;
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update t1 set a=11 where a=5;
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update t1 set a=a+20 where a=1;
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select * from t1;
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--error ER_DUP_ENTRY
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update t1 set a=3 where a=2;
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--error ER_DUP_ENTRY
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update t1 set a=4 where a=3;
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--echo #no change in blob key
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update t1 set a=3 where a=3;
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update t1 set a=2 where a=2;
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select* from t1;
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--echo #IGNORE;
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update ignore t1 set a=3 where a=2;
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update ignore t1 set a=4 where a=3;
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select * from t1;
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drop table t1;
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--echo #test 2;
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create table t1 (a int primary key, b blob unique , c int unique );
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show keys from t1;
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insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
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select * from t1 limit 3;
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update t1 set b=34 where a=1;
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update t1 set b=a+c+b+34 where b=2;
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update t1 set b=a+10+b where c=3;
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select * from t1;
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truncate table t1;
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insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
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--error ER_DUP_ENTRY
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update t1 set b=4 where a=3;
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--error ER_DUP_ENTRY
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update t1 set b=a+1 where b=3;
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--error ER_DUP_ENTRY
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update t1 set b=a+1 where c=3;
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--echo #no change in blob key
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update t1 set b=3 where a=3;
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update t1 set b=2 where b=2;
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update t1 set b=5 where c=5;
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select* from t1;
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--echo #IGNORE;
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update ignore t1 set b=3 where a=2;
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update ignore t1 set b=4 where b=3;
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update ignore t1 set b=5 where c=3;
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select * from t1;
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drop table t1;
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--echo #test 3;
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create table t1 (a blob unique, b blob unique , c blob unique);
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show keys from t1;
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insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
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select * from t1 limit 3;
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update t1 set b=34 where a=1;
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update t1 set b=a+c+b+34 where b=2;
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update t1 set b=a+10+b where c=3;
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select * from t1;
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truncate table t1;
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insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
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--error ER_DUP_ENTRY
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update t1 set b=4 where a=3;
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--error ER_DUP_ENTRY
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update t1 set b=a+1 where b=3;
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--error ER_DUP_ENTRY
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update t1 set b=a+1 where c=3;
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--echo #no change in blob key
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update t1 set b=3 where a=3;
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update t1 set b=2 where b=2;
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update t1 set b=5 where c=5;
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select* from t1;
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--echo #IGNORE;
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update ignore t1 set b=3 where a=2;
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update ignore t1 set b=4 where b=3;
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update ignore t1 set b=5 where c=3;
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update ignore t1 set b=b+3 where a>1 or b>1 or c>1;
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select * from t1;
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update ignore t1 set b=b+5 where a>1 and b<5 and c<a+b;
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select * from t1;
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drop table t1;
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--echo #test 4 ultimate test;
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create table t1 (a int primary key , b int, c blob , d blob , e varchar(2000), f int , g text,
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unique (b,c), unique (b,f),unique(e,g),unique(a,b,c,d,e,f,g));
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desc t1;
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show create table t1;
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show keys from t1;
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insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
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(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
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select * from t1 limit 3;
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--echo #key b_c
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--error ER_DUP_ENTRY
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update t1 set b=2 ,c=2 where a=1;
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update t1 set b=b+34, c=c+34 where e=1 and g=1 ;
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update t1 set b=35, c=35 where e=1 and g=1 ;
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--error ER_DUP_ENTRY
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update t1 set b=b+1, c=c+1 where a>0;
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update ignore t1 set b=b+1, c=c+1 where a>0;
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select * from t1 ;
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truncate table t1;
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insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
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(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
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--echo #key b_f no hash key
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--error ER_DUP_ENTRY
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update t1 set b=2 , f=2 where a=1;
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update t1 set b=b+33, f=f+33 where e=1 and g=1;
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update t1 set b=34, f=34 where e=1 and g=1 ;
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--error ER_DUP_ENTRY
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update t1 set b=b+1, f=f+1 where a>0;
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update ignore t1 set b=b+1, f=f+1 where a>0;
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select * from t1 ;
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truncate table t1;
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insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
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(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
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--echo #key e_g
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--error ER_DUP_ENTRY
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update t1 set e=2 , g=2 where a=1;
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update t1 set e=e+34, g=g+34 where a=1;
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update t1 set e=34, g=34 where e=1 and g=1 ;
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select * from t1 where a=1;
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--error ER_DUP_ENTRY
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update t1 set e=e+1, g=g+1 where a>0;
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update ignore t1 set e=e+1, g=g+1 where a>0;
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select * from t1 ;
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drop table t1;
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