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MDEV-37939 Add function context to division by zero warnings #4569

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MDEV-37939 Add function context to division by zero warnings #4569

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660eec9
MDEV-37939 Add function context to division by zero warnings
alexaustin007 Jan 21, 2026
3986024
MDEV-37939 Add function context to division by zero warnings
alexaustin007 Jan 22, 2026
7ee031f
MDEV-37939 Use correct warning for invalid logarithm arguments
alexaustin007 Jan 22, 2026
3c626e4
MDEV-37939: use proper log domain warnings
alexaustin007 Jan 23, 2026
9988b88
MDEV-37939: make log-domain warning helper static
alexaustin007 Jan 26, 2026
ad84316
MDEV-37939: Update test results for LOG domain warnings
alexaustin007 Jan 27, 2026
a9a34e6
MDEV-37939: Update test results for rebased error codes
alexaustin007 Jan 28, 2026
127f61e
MDEV-37939: Update test results for rebased error codes
alexaustin007 Feb 21, 2026
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28 changes: 14 additions & 14 deletions mysql-test/main/func_math.result
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Original file line number Diff line number Diff line change
Expand Up @@ -45,9 +45,9 @@ select log(exp(10)),exp(log(sqrt(10))*2),log(-1),log(NULL),log(1,1),log(3,9),log
log(exp(10)) exp(log(sqrt(10))*2) log(-1) log(NULL) log(1,1) log(3,9) log(-1,2) log(NULL,2)
10 10.000000000000002 NULL NULL NULL 2 NULL NULL
Warnings:
Warning 1365 Division by 0
Warning 1365 Division by 0
Warning 1365 Division by 0
Warning 4257 Passing non-positive argument to log() makes the function's result undefined
Warning 4258 Passing non-positive or equal-to-1 base to log() makes the function's result undefined
Warning 4258 Passing non-positive or equal-to-1 base to log() makes the function's result undefined
explain extended select log(exp(10)),exp(log(sqrt(10))*2),log(-1),log(NULL),log(1,1),log(3,9),log(-1,2),log(NULL,2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Expand All @@ -57,8 +57,8 @@ select ln(exp(10)),exp(ln(sqrt(10))*2),ln(-1),ln(0),ln(NULL);
ln(exp(10)) exp(ln(sqrt(10))*2) ln(-1) ln(0) ln(NULL)
10 10.000000000000002 NULL NULL NULL
Warnings:
Warning 1365 Division by 0
Warning 1365 Division by 0
Warning 4256 Passing non-positive argument to ln() makes the function's result undefined
Warning 4256 Passing non-positive argument to ln() makes the function's result undefined
explain extended select ln(exp(10)),exp(ln(sqrt(10))*2),ln(-1),ln(0),ln(NULL);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Expand All @@ -68,8 +68,8 @@ select log2(8),log2(15),log2(-2),log2(0),log2(NULL);
log2(8) log2(15) log2(-2) log2(0) log2(NULL)
3 3.9068905956085187 NULL NULL NULL
Warnings:
Warning 1365 Division by 0
Warning 1365 Division by 0
Warning 4259 Passing non-positive argument to log2() makes the function's result undefined
Warning 4259 Passing non-positive argument to log2() makes the function's result undefined
explain extended select log2(8),log2(15),log2(-2),log2(0),log2(NULL);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Expand All @@ -79,8 +79,8 @@ select log10(100),log10(18),log10(-4),log10(0),log10(NULL);
log10(100) log10(18) log10(-4) log10(0) log10(NULL)
2 1.255272505103306 NULL NULL NULL
Warnings:
Warning 1365 Division by 0
Warning 1365 Division by 0
Warning 4260 Passing non-positive argument to log10() makes the function's result undefined
Warning 4260 Passing non-positive argument to log10() makes the function's result undefined
explain extended select log10(100),log10(18),log10(-4),log10(0),log10(NULL);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Expand Down Expand Up @@ -239,27 +239,27 @@ select ln(-1);
ln(-1)
NULL
Warnings:
Warning 1365 Division by 0
Warning 4256 Passing non-positive argument to ln() makes the function's result undefined
select log10(-1);
log10(-1)
NULL
Warnings:
Warning 1365 Division by 0
Warning 4260 Passing non-positive argument to log10() makes the function's result undefined
select log2(-1);
log2(-1)
NULL
Warnings:
Warning 1365 Division by 0
Warning 4259 Passing non-positive argument to log2() makes the function's result undefined
select log(2,-1);
log(2,-1)
NULL
Warnings:
Warning 1365 Division by 0
Warning 4257 Passing non-positive argument to log() makes the function's result undefined
select log(-2,1);
log(-2,1)
NULL
Warnings:
Warning 1365 Division by 0
Warning 4258 Passing non-positive or equal-to-1 base to log() makes the function's result undefined
set sql_mode='';
select round(111,-10);
round(111,-10)
Expand Down
238 changes: 238 additions & 0 deletions mysql-test/main/func_math_div_zero.result
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Original file line number Diff line number Diff line change
@@ -0,0 +1,238 @@
#
# MDEV-37939: Use correct error for invalid logarithm arguments
#
# LOG/LN/LOG2/LOG10 now emit function-specific domain warnings
# instead of ER_DIVISION_BY_ZERO, since these functions do not
# perform division.
#
#
# Test valid inputs first (before any warning-producing statements)
# This ensures SHOW WARNINGS is truly empty
#
SET SESSION sql_mode='ERROR_FOR_DIVISION_BY_ZERO';
SELECT LOG(10);
LOG(10)
2.302585092994046
SELECT LN(2.718);
LN(2.718)
0.999896315728952
SELECT LOG2(8);
LOG2(8)
3
SELECT LOG10(100);
LOG10(100)
2
SELECT LOG(2, 8);
LOG(2, 8)
3
SHOW WARNINGS;
Level Code Message
# Should be empty - valid inputs produce no warnings
#
# Test sql_mode='' behavior (before any warnings are produced)
#
SET SESSION sql_mode='';
SELECT LOG(-1);
LOG(-1)
NULL
SHOW WARNINGS;
Level Code Message
# Should be empty - no warning when sql_mode doesn't include ERROR_FOR_DIVISION_BY_ZERO
SELECT LN(-1);
LN(-1)
NULL
SHOW WARNINGS;
Level Code Message
#
# Now test warning-producing cases
#
SET SESSION sql_mode='ERROR_FOR_DIVISION_BY_ZERO';
#
# LOG family should report function-specific domain warnings
#
SELECT LOG(-1);
LOG(-1)
NULL
Warnings:
Warning 4257 Passing non-positive argument to log() makes the function's result undefined
SHOW WARNINGS;
Level Code Message
Warning 4257 Passing non-positive argument to log() makes the function's result undefined
SELECT LOG(0);
LOG(0)
NULL
Warnings:
Warning 4257 Passing non-positive argument to log() makes the function's result undefined
SHOW WARNINGS;
Level Code Message
Warning 4257 Passing non-positive argument to log() makes the function's result undefined
SELECT LN(0);
LN(0)
NULL
Warnings:
Warning 4256 Passing non-positive argument to ln() makes the function's result undefined
SHOW WARNINGS;
Level Code Message
Warning 4256 Passing non-positive argument to ln() makes the function's result undefined
SELECT LN(-5);
LN(-5)
NULL
Warnings:
Warning 4256 Passing non-positive argument to ln() makes the function's result undefined
SHOW WARNINGS;
Level Code Message
Warning 4256 Passing non-positive argument to ln() makes the function's result undefined
SELECT LOG2(-1);
LOG2(-1)
NULL
Warnings:
Warning 4259 Passing non-positive argument to log2() makes the function's result undefined
SHOW WARNINGS;
Level Code Message
Warning 4259 Passing non-positive argument to log2() makes the function's result undefined
SELECT LOG10(-1);
LOG10(-1)
NULL
Warnings:
Warning 4260 Passing non-positive argument to log10() makes the function's result undefined
SHOW WARNINGS;
Level Code Message
Warning 4260 Passing non-positive argument to log10() makes the function's result undefined
# Two-argument LOG: invalid second argument
SELECT LOG(2, -1);
LOG(2, -1)
NULL
Warnings:
Warning 4257 Passing non-positive argument to log() makes the function's result undefined
SHOW WARNINGS;
Level Code Message
Warning 4257 Passing non-positive argument to log() makes the function's result undefined
# Two-argument LOG: invalid base (negative)
SELECT LOG(-2, 10);
LOG(-2, 10)
NULL
Warnings:
Warning 4258 Passing non-positive or equal-to-1 base to log() makes the function's result undefined
SHOW WARNINGS;
Level Code Message
Warning 4258 Passing non-positive or equal-to-1 base to log() makes the function's result undefined
# Two-argument LOG: base = 1 (invalid - would cause log(1)=0 in denominator)
SELECT LOG(1, 10);
LOG(1, 10)
NULL
Warnings:
Warning 4258 Passing non-positive or equal-to-1 base to log() makes the function's result undefined
SHOW WARNINGS;
Level Code Message
Warning 4258 Passing non-positive or equal-to-1 base to log() makes the function's result undefined
#
# Division operations should report ER_DIVISION_BY_ZERO (1365)
#
# Division - integer
SELECT 1/0;
1/0
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# Division - real/float
SELECT 1.0/0.0;
1.0/0.0
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# Division - decimal
SELECT CAST(1 AS DECIMAL(10,2)) / CAST(0 AS DECIMAL(10,2));
CAST(1 AS DECIMAL(10,2)) / CAST(0 AS DECIMAL(10,2))
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# Division - with string arguments
SELECT '1'/'0';
'1'/'0'
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# Integer DIV
SELECT 5 DIV 0;
5 DIV 0
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# Integer DIV - with string arguments
SELECT '5' DIV '0';
'5' DIV '0'
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# MOD - integer
SELECT 5 MOD 0;
5 MOD 0
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# MOD - real/float
SELECT 5.5e0 MOD 0.0e0;
5.5e0 MOD 0.0e0
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# MOD - decimal
SELECT CAST(5 AS DECIMAL(10,2)) MOD CAST(0 AS DECIMAL(10,2));
CAST(5 AS DECIMAL(10,2)) MOD CAST(0 AS DECIMAL(10,2))
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# MOD - with string arguments
SELECT '5' MOD '0';
'5' MOD '0'
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# MOD function syntax
SELECT MOD(5, 0);
MOD(5, 0)
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
# MOD function - decimal
SELECT MOD(5.5, 0.0);
MOD(5.5, 0.0)
NULL
Warnings:
Warning 1365 Division by 0
SHOW WARNINGS;
Level Code Message
Warning 1365 Division by 0
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