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44b41979bd
UPDATES THE TABLE ENTRIES (formerly 55385)
BUG#11764529: MULTI UPDATE+INNODB REPORTS ER_KEY_NOT_FOUND
IF A TABLE IS UPDATED TWICE (formerly 57373)
If multiple-table update updates a row through two aliases and
the first update physically moves the row, the second update will
fail to locate the row. This results in different errors
depending on storage engine:
* MyISAM: Got error 134 from storage engine
* InnoDB: Can't find record in 'tbl'
None of these errors accurately describe the problem.
Furthermore, since MyISAM is non-transactional, the update
executed first will be performed while the second will not.
In addition, for two equal multiple-table update statements,
one could succeed and the other fail based on whether or not
the record actually moved or not. This was inconsistent.
Two update operations may physically move a row:
1) Update of a column in a clustered primary key
2) Update of a column used to calculate which partition the
row belongs to
BUG#11764529 is about case 1) above, BUG#11762751 was about case 2).
The fix for these bugs is to return with an error if multiple-table
update is about to:
a) Update a table through multiple aliases, and
b) Perform an update that may physically more the row
in at least one of these aliases
This avoids
* partial updates as described for MyISAM above,
* provides the same error message that describes the actual problem
for all SEs
* inconsistent behavior where a statement fails or succeeds based on
e.g. the partitioning algorithm of the table.
29 lines
743 B
Text
29 lines
743 B
Text
#
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# BUG#57373: Multi update+InnoDB reports ER_KEY_NOT_FOUND if a
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# table is updated twice
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#
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CREATE TABLE t1(
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pk INT,
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a INT,
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b INT,
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PRIMARY KEY (pk)
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) ENGINE=InnoDB;
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INSERT INTO t1 VALUES (0,0,0);
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UPDATE t1 AS A, t1 AS B SET A.pk = 1, B.a = 2;
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ERROR HY000: Primary key/partition key update is not allowed since the table is updated both as 'A' and 'B'.
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SELECT * FROM t1;
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pk a b
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0 0 0
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CREATE VIEW v1 AS SELECT * FROM t1;
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UPDATE v1 AS A, t1 AS B SET A.pk = 1, B.a = 2;
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ERROR HY000: Primary key/partition key update is not allowed since the table is updated both as 'A' and 'B'.
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SELECT * FROM t1;
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pk a b
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0 0 0
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UPDATE t1 AS A, t1 AS B SET A.a = 1, B.b = 2;
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# Should be (0,1,2)
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SELECT * FROM t1;
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pk a b
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0 1 2
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DROP VIEW v1;
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DROP TABLE t1;
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