Description:
When using the LAG() window function in an arithmetic expression, the result may be wrong
How to repeat:
This statement:
WITH tab(t, company, quote) AS (
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SELECT 1 AS t, 'G' AS company, 40 AS quote
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UNION SELECT 2 , 'G', 60
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UNION SELECT 3 , 'S', 60
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UNION SELECT 4, 'S', 20
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)
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SELECT DISTINCT company, quote - LAG(quote) OVER(PARTITION BY company ORDER BY t)
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FROM tab;
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produces wrong output:
company e
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--------------
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G (null)
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S (null)
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Remove the DISTINCT keyword....
WITH tab(t, company, quote) AS (
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SELECT 1 AS t, 'G' AS company, 40 AS quote
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UNION SELECT 2 , 'G', 60
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UNION SELECT 3 , 'S', 60
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UNION SELECT 4, 'S', 20
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)
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SELECT company, quote - LAG(quote) OVER(PARTITION BY company ORDER BY t) e
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FROM tab;
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to get this:
company e
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--------------
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G (null)
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G 20
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S (null)
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S -40
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As can be seen, the DISTINCT keyword should have no effect on this query.
This is also described in this stack overflow question:
https://stackoverflow.com/q/49700278/521799
The same bug appears also in MySQL:
https://bugs.mysql.com/bug.php?id=92503
- is duplicated by
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MDEV-14791
Crash with order by expression containing window functions
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Closed
Alice Sherepa
made changes -
| Field |
Original Value |
New Value |
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Assignee
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Alice Sherepa
[ alice
]
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Alice Sherepa
made changes -
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Status
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Open
[ 1
]
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Confirmed
[ 10101
]
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Alice Sherepa
made changes -
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Assignee
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Alice Sherepa
[ alice
]
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Vicentiu Ciorbaru
[ cvicentiu
]
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Alice Sherepa
made changes -
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Affects Version/s
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10.2
[ 14601
]
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Affects Version/s
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10.3
[ 22126
]
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Alice Sherepa
made changes -
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Fix Version/s
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10.2
[ 14601
]
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Fix Version/s
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10.3
[ 22126
]
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Alice Sherepa
made changes -
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Component/s
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Optimizer - Window functions
[ 13502
]
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Component/s
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Data Manipulation - Subquery
[ 10107
]
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Alice Sherepa
made changes -
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Affects Version/s
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10.4
[ 22408
]
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Alice Sherepa
made changes -
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Fix Version/s
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10.4
[ 22408
]
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Alice Sherepa
made changes -
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Assignee
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Vicentiu Ciorbaru
[ cvicentiu
]
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Varun Gupta
[ varun
]
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Varun Gupta (Inactive)
made changes -
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Fix Version/s
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N/A
[ 14700
]
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Fix Version/s
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10.2
[ 14601
]
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Fix Version/s
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10.3
[ 22126
]
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Fix Version/s
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10.4
[ 22408
]
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Resolution
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Duplicate
[ 3
]
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Status
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In Progress
[ 3
]
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Closed
[ 6
]
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Sergei Golubchik
made changes -
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Workflow
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MariaDB v3
[ 89670
]
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MariaDB v4
[ 154957
]
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