Details
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Bug
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Status: Open (View Workflow)
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Minor
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Resolution: Unresolved
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10.0, 10.1, 10.2
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None
Description
PREPARE stmt FROM "SELECT LEFT('a','b')";
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SHOW WARNINGS;
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EXECUTE stmt;
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SHOW WARNINGS;
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returns the following:
Query OK, 0 rows affected, 1 warning (0.00 sec)
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Statement prepared
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|
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+---------+------+----------------------------------------+
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| Level | Code | Message |
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+---------+------+----------------------------------------+
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| Warning | 1292 | Truncated incorrect INTEGER value: 'b' |
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+---------+------+----------------------------------------+
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1 row in set (0.00 sec)
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|
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+---------------+
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| LEFT('a','b') |
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+---------------+
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| |
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+---------------+
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1 row in set, 2 warnings (0.00 sec)
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|
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+---------+------+----------------------------------------+
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| Level | Code | Message |
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+---------+------+----------------------------------------+
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| Warning | 1292 | Truncated incorrect INTEGER value: 'b' |
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| Warning | 1292 | Truncated incorrect INTEGER value: 'b' |
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+---------+------+----------------------------------------+
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2 rows in set (0.00 sec)
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Notice, one warning is sent during PREPARE.
Then two warnings are sent during EXECUTE:
- one warning during fix_length_and_dec()
- another warning during the actual query execution
There could be less warnings.
Serg proposed that fix_length_and_dec() could put args[1] into either of these:
- Item_int
- Item_cache_int
- Item_int_with_ref
This would fix redundant warnings and help to avoid unnecessary strtoll10() calls per every row.
The problem is also repeatable with:
PREPARE stmt FROM "SELECT LPAD('a','b','c')";
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SHOW WARNINGS;
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EXECUTE stmt;
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SHOW WARNINGS
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