Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Duplicate
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10.0
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None
Description
This problem was earlier fixed in 10.1 and is not really repeatable in 10.2.
DROP TABLE IF EXISTS t1; |
CREATE TABLE t1 (a BIT(64),b INT); |
INSERT INTO t1 VALUES (0xFFFFFFFFFFFFFFFF,-1); |
SELECT a>b, GREATEST(a,b) FROM t1; |
+------+---------------+
|
| a>b | GREATEST(a,b) |
|
+------+---------------+
|
| 1 | -1 |
|
+------+---------------+
|
The value of the first column looks good, as BIT is treated like a unsigned number, according to design.
The value of the second column is wrong. It should return 18446744073709551615.
Now I do:
DROP TABLE IF EXISTS t2; |
CREATE TABLE t2 AS SELECT COALESCE(a,b),GREATEST(a,b) FROM t1; |
SELECT * FROM t2; |
+----------------------+---------------+
|
| COALESCE(a,b) | GREATEST(a,b) |
|
+----------------------+---------------+
|
| 18446744073709551615 | -1 |
|
+----------------------+---------------+
|
The value of the first column with COALESCE is correct.
The value of the first column with GREATEST is wrong.
Now I check the table structure:
SHOW CREATE TABLE t2; |
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------+
|
| Table | Create Table |
|
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------+
|
| t2 | CREATE TABLE `t2` (
|
`COALESCE(a,b)` decimal(64,0) DEFAULT NULL,
|
`GREATEST(a,b)` bigint(65) DEFAULT NULL
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
|
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------+
|
The data type of the first column with COALESCE is correct.
The data type of the second column with GREATEST is wrong.
Attachments
Issue Links
- duplicates
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- Closed
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- relates to
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MDEV-12506 Split Item_func_min_max::fix_length_and_dec() into methods in Type_handler
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- Closed
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