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fix div by zero in decimal var/stddev

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This commit is contained in:
chertus 2018-09-26 15:38:36 +03:00
parent b48402e871
commit 3ff2cfb4af
1 changed files with 8 additions and 3 deletions
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11
dbms/src/AggregateFunctions/AggregateFunctionStatisticsSimple.h
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@ -116,9 +116,12 @@ struct VarMomentsDecimal
Float64 getPopulation(UInt32 scale) const
{
if (m0 == 0)
return std::numeric_limits<Float64>::infinity();
NativeType tmp;
if (common::mulOverflow(m1, m1, tmp) ||
common::subOverflow(m2, NativeType(tmp/m0), tmp))
common::subOverflow(m2, NativeType(tmp / m0), tmp))
throw Exception("Decimal math overflow", ErrorCodes::DECIMAL_OVERFLOW);
return convertFromDecimal<DataTypeDecimal<T>, DataTypeNumber<Float64>>(tmp / m0, scale);
}
@ -126,11 +129,13 @@ struct VarMomentsDecimal
Float64 getSample(UInt32 scale) const
{
if (m0 == 0)
return std::numeric_limits<T>::quiet_NaN();
return std::numeric_limits<Float64>::quiet_NaN();
if (m0 == 1)
return std::numeric_limits<Float64>::infinity();
NativeType tmp;
if (common::mulOverflow(m1, m1, tmp) ||
common::subOverflow(m2, NativeType(tmp/m0), tmp))
common::subOverflow(m2, NativeType(tmp / m0), tmp))
throw Exception("Decimal math overflow", ErrorCodes::DECIMAL_OVERFLOW);
return convertFromDecimal<DataTypeDecimal<T>, DataTypeNumber<Float64>>(tmp / (m0 - 1), scale);
}