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When updating a table with virtual BLOB columns, the following might happen: - an old record is read from the table, it has no virtual blob values - update_virtual_fields() is run, vcol blob gets its value into the record. But only a pointer to the value is in the table->record[0], the value is in Field_blob::value String (but it doesn't have to be! it can be in the record, if the column is just a copy of another columns: ... b VARCHAR, c BLOB AS (b) ...) - store_record(table,record[1]), old record now is in record[1] - fill_record() prepares new values in record[0], vcol blob is updated, new value replaces the old one in the Field_blob::value - now both record[1] and record[0] have a pointer that points to the *new* vcol blob value. Or record[1] has a pointer to nowhere if Field_blob::value had to realloc. To resolve this we unlink vcol blobs from the pointer to the data (in the record[1]). Because the value is not *always* in the Field_blob::value String, we need to remember what blobs were unlinked. The orphan memory must be freed manually. To complicate the matter, ha_update_row() is also used in multi-update, in REPLACE, in INSERT ... ON DUPLICATE KEY UPDATE, also on REPLACE ... SELECT, REPLACE DELAYED, and LOAD DATA REPLACE, etc
112 lines
3.6 KiB
Text
112 lines
3.6 KiB
Text
#
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# Test how UPDATE detects what columns need to be read (or generated) in a row
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#
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# stored column depends on virtual column depends on updated column.
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# this tests TABLE::mark_virtual_columns_for_write()
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#
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create table t1 (a int, b int as (a+1), c int as (b+1) stored);
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insert t1 set a=1;
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select * from t1;
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update t1 set a=2;
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select * from t1;
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drop table t1;
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#
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# one keypart is virtual, the other keypart is updated
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# this tests TABLE::mark_columns_needed_for_update()
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#
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create table t1 (a int, c int as(a), p varchar(20) as(y), y char(20), index (p,c));
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insert into t1 (a,y) values(1, "yyy");
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update t1 set a = 100 where a = 1;
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drop table t1;
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#
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# note: prefix keys below
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#
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create table t1 (
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a varchar(10000),
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b varchar(3000),
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c varchar(14000) generated always as (concat(a,b)) virtual,
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d varchar(5000) generated always as (b) virtual,
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e int(11) generated always as (10) virtual,
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h int(11) not null primary key,
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index(c(100), d(20)));
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insert t1 (a,b,h) values (repeat('g', 10000), repeat('x', 2800), 1);
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update t1 set a = repeat(cast(1 as char), 2000);
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drop table t1;
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create table t1 (
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a varchar(10000),
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b varchar(3000),
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c varchar(14000) generated always as (concat(a,b)) virtual,
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i varchar(5000) generated always as (b) virtual,
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d varchar(5000) generated always as (i) virtual,
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e int(11) generated always as (10) virtual,
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h int(11) not null primary key,
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index(c(100), d(20)));
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insert t1 (a,b,h) values (repeat('g', 10000), repeat('x', 2800), 1);
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update t1 set a = repeat(cast(1 as char), 2000);
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drop table t1;
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#
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# UPDATE disguised as INSERT
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#
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create table t1(a blob not null, b int, c varbinary (10) generated always as (a) virtual, unique (c(9)));
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insert t1 (a,b) values ('a', 1);
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replace t1 set a = 'a',b =1;
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insert t1 (a,b) values ('a', 1) on duplicate key update a='b', b=2;
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select * from t1;
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drop table t1;
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#
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# multi-UPDATE and const tables
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#
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create table t (a int primary key, b int, c int as (b), index (c));
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insert t (a,b) values (9,0);
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create table t2 select * from t;
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update t, t2 set t.b=10 where t.a=t2.a;
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check table t; select * from t;
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drop table t, t2;
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#
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# blobs
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# This tests BLOB_VALUE_ORPHANAGE
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#
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create table t1 (a int, b int, c int, d int, e int);
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insert t1 values (1,2,3,4,5), (1,2,3,4,5);
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create table t (a int primary key,
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b int, c blob as (b), index (c(57)),
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d blob, e blob as (d), index (e(57)))
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replace select * from t1;
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check table t; select * from t;
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update t set a=10, b=1, d=1;
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check table t; select * from t;
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replace t (a,b,d) values (10,2,2);
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check table t; select * from t;
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--error ER_WRONG_VALUE_COUNT_ON_ROW
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insert t(a,b,d) values (10) on duplicate key update b=3;
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insert t(a,b,d) values (10,2,2) on duplicate key update b=3, d=3;
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check table t; select * from t;
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replace t (a,b,d) select 10,4,4;
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check table t; select * from t;
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insert t(a,b,d) select 10,4,4 on duplicate key update b=5, d=5;
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check table t; select * from t;
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replace delayed t (a,b,d) values (10,6,6);
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flush tables;
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check table t; select * from t;
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insert delayed t(a,b,d) values (10,6,6) on duplicate key update b=7, d=7;
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flush tables;
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check table t; select * from t;
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--write_file $MYSQLTEST_VARDIR/tmp/vblobs.txt
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10 8 foo 8 foo
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EOF
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--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
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--eval load data infile '$MYSQLTEST_VARDIR/tmp/vblobs.txt' replace into table t
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--remove_file $MYSQLTEST_VARDIR/tmp/vblobs.txt
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check table t; select * from t;
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update t set a=11, b=9, d=9 where a>5;
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check table t; select * from t;
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create table t2 select * from t;
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update t, t2 set t.b=10, t.d=10 where t.a=t2.a;
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check table t; select * from t;
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update t, t tt set t.b=11, tt.d=11 where t.a=tt.a;
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check table t; select * from t;
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drop table t, t1, t2;
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