This bug occurs when running 10.2 testsuite with Connector/C:
perl mysql-test-run func_time --ps-protocol
When a string value, e.g "0" rather than number, is passed to from_unixtime() function the number of decimals is wrong (31 instead of 0). Also length value is not correct.
How to repeat:
MariaDB [test]> select from_unixtime(0), from_unixtime("0");
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Field 1: `from_unixtime(0)`
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Catalog: `def`
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Database: ``
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Table: ``
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Org_table: ``
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Type: DATETIME
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Collation: binary (63)
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Length: 19
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Max_length: 19
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Decimals: 0
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Flags: BINARY
|
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Field 2: `from_unixtime("0")`
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Catalog: `def`
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Database: ``
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Table: ``
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Org_table: ``
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Type: DATETIME
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Collation: binary (63)
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Length: 26 <----- ????
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Max_length: 19
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Decimals: 31 <---- ????
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Flags: BINARY
|
|
|
+---------------------+---------------------+
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| from_unixtime(0) | from_unixtime("0") |
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+---------------------+---------------------+
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| 1970-01-01 01:00:00 | 1970-01-01 01:00:00 |
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+---------------------+---------------------+
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1 row in set (0.00 sec)
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Bug
Major
The 'Length 26' is the correct value. The 'Decimals 31' means that we don't know the exact precision. So the client just should handle this properly.