Details
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Bug
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Status: Closed (View Workflow)
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Critical
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Resolution: Fixed
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10.2(EOL), 10.3(EOL)
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None
Description
I have a table with a company employee hierarchy:
DROP TABLE IF EXISTS t1; |
CREATE TABLE t1 |
(
|
id INT, -- employee ID |
mid INT, -- manager ID, or NULL if top level employee |
name TEXT -- employee name |
);
|
INSERT INTO t1 VALUES (0,NULL, 'Name'); |
INSERT INTO t1 VALUES (1,0, 'Name1'); |
INSERT INTO t1 VALUES (2,0, 'Name2'); |
INSERT INTO t1 VALUES (11,1, 'Name11'); |
INSERT INTO t1 VALUES (12,1, 'Name12'); |
Now I want to print the company hierarchy as a table that additionally includes employee hierarchy levels and manager names. I use a recursive CTE for that:
DROP TABLE IF EXISTS t2; |
CREATE TABLE t2 AS |
WITH RECURSIVE |
cteReports (level, id, mid, name) AS |
(
|
SELECT 1, id, mid, name FROM t1 WHERE mid IS NULL |
UNION ALL |
SELECT r.level + 1, e.id, e.mid, e.name FROM t1 e |
INNER JOIN cteReports r ON e.mid = r.id |
)
|
SELECT
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level, id, mid, name, |
(SELECT name FROM t1 WHERE id= cteReports.mid) AS mname |
FROM cteReports |
ORDER BY level, mid; |
SHOW CREATE TABLE t2; |
SELECT * FROM t2; |
It creates a table with the expected structure:
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|
| Table | Create Table |
|
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|
| t2 | CREATE TABLE `t2` (
|
`level` bigint(1) NOT NULL DEFAULT 0,
|
`id` int(11) DEFAULT NULL,
|
`mid` int(11) DEFAULT NULL,
|
`name` text DEFAULT NULL,
|
`mname` text DEFAULT NULL
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
|
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|
and with correct data:
+-------+------+------+--------+-------+
|
| level | id | mid | name | mname |
|
+-------+------+------+--------+-------+
|
| 1 | 0 | NULL | Name | NULL |
|
| 2 | 1 | 0 | Name1 | Name |
|
| 2 | 2 | 0 | Name2 | Name |
|
| 3 | 11 | 1 | Name11 | Name1 |
|
| 3 | 12 | 1 | Name12 | Name1 |
|
+-------+------+------+--------+-------+
|
Now I want for some reasons to add some big number to manager IDs (mid):
DROP TABLE IF EXISTS t2; |
CREATE TABLE t2 AS |
WITH RECURSIVE |
cteReports (level, id, mid, name) AS |
(
|
SELECT 1, id, mid, name FROM t1 WHERE mid IS NULL |
UNION ALL |
SELECT r.level + 1, e.id, e.mid + 1000000000000, e.name FROM t1 e |
INNER JOIN cteReports r ON e.mid = r.id |
)
|
SELECT
|
level, id, mid, name, |
(SELECT name FROM t1 WHERE id= cteReports.mid) AS mname |
FROM cteReports |
ORDER BY level, mid; |
SHOW CREATE TABLE t2; |
SELECT * FROM t2; |
It creates exactly the same table to the one in the previous script and truncates data silently:
+-------+------+------------+--------+-------+
|
| level | id | mid | name | mname |
|
+-------+------+------------+--------+-------+
|
| 1 | 0 | NULL | Name | NULL |
|
| 2 | 1 | 2147483647 | Name1 | NULL |
|
| 2 | 2 | 2147483647 | Name2 | NULL |
|
| 3 | 11 | 2147483647 | Name11 | NULL |
|
| 3 | 12 | 2147483647 | Name12 | NULL |
|
+-------+------+------------+--------+-------+
|
This looks wrong. Instead if INT, the expected column type for mid should be BIGINT or DECIMAL, and no data truncation should happen.
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