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Fix assert when decimal has too large negative exponent

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This commit is contained in:
Alexey Milovidov 2020-08-02 05:35:44 +03:00
parent 18b21511a9
commit c8ed684a72
3 changed files with 31 additions and 6 deletions
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21
src/IO/readDecimalText.h
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@ -160,12 +160,21 @@ inline void readDecimalText(ReadBuffer & buf, T & x, uint32_t precision, uint32_
if (static_cast<int32_t>(scale) + exponent < 0)
{
/// Too many digits after point. Just cut off excessive digits.
auto divisor = intExp10OfSize<T>(-exponent - static_cast<int32_t>(scale));
assert(divisor > 0); /// This is for Clang Static Analyzer. It is not smart enough to infer it automatically.
x.value /= divisor;
scale = 0;
return;
if (-exponent >= std::numeric_limits<typename T::NativeType>::digits10)
{
/// Too big negative exponent
x.value = 0;
scale = 0;
return;
}
else
{
/// Too many digits after point. Just cut off excessive digits.
auto divisor = intExp10OfSize<T>(-exponent - static_cast<int32_t>(scale));
x.value /= divisor;
scale = 0;
return;
}
}
scale += exponent;

6
tests/queries/0_stateless/01425_decimal_parse_big_negative_exponent.reference Normal file
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@ -0,0 +1,6 @@
1E-9 0
1E-8 0
1E-7 0
1e-7 0
1E-9 0.000000001
1E-10 0.000000000

10
tests/queries/0_stateless/01425_decimal_parse_big_negative_exponent.sql Normal file
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@ -0,0 +1,10 @@
SELECT '-1E9-1E9-1E9-1E9' AS x, toDecimal32(x, 0); -- { serverError 6 }
SELECT '-1E9' AS x, toDecimal32(x, 0); -- { serverError 69 }
SELECT '1E-9' AS x, toDecimal32(x, 0);
SELECT '1E-8' AS x, toDecimal32(x, 0);
SELECT '1E-7' AS x, toDecimal32(x, 0);
SELECT '1e-7' AS x, toDecimal32(x, 0);
SELECT '1E-9' AS x, toDecimal32(x, 9);
SELECT '1E-9' AS x, toDecimal32(x, 10); -- { serverError 69 }
SELECT '1E-10' AS x, toDecimal32(x, 10); -- { serverError 69 }
SELECT '1E-10' AS x, toDecimal32(x, 9);