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[fix][libexpr] Fix issue about decimal scale. #48

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Merged
githubgxll merged 1 commit into from
Dec 29, 2025
Merged

[fix][libexpr] Fix issue about decimal scale. #48

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9 changes: 8 additions & 1 deletion src/expr/calc/casting.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1629,7 +1629,14 @@ String Cast(double v) {

template <>
String Cast(DecimalP v) {
return v->toString();
long precision = v.getDecimalPrecision();
long scale = v.getDecimalScale();

if (precision > 0 && scale >= 0) {
return v->toString(precision, scale);
} else {
return v->toString();
}
}

template <>
Expand Down
14 changes: 12 additions & 2 deletions src/types/decimal/decimal.cc
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Expand Up @@ -28,7 +28,7 @@ namespace types {
#define SHOW_EXCEPTION_INFO
#endif

Decimal::Decimal(const std::string & var) {
void Decimal::decimal_internal(const std::string & var) {
try {
int i = 0;
bool followingE = false;
Expand All @@ -44,7 +44,7 @@ Decimal::Decimal(const std::string & var) {
&& var[i] != '-' && var[i] != '+'
&& (var[i] < 0x30 || var[i] > 0x39)) {
break;
}
}
}

if (i == 0) {
Expand All @@ -61,6 +61,16 @@ Decimal::Decimal(const std::string & var) {
}
}

Decimal::Decimal(const std::string & var) {
decimal_internal(var);
}

Decimal::Decimal(const std::string & var, long precision, long scale) {
decimal_internal(var);
this->precision = precision;
this->scale = scale;
}

Decimal::Decimal(const char * var) : v(mpf_class(var, MAX_PRECISION, BASE)) {
PRINT_DECIMAL;
}
Expand Down
45 changes: 44 additions & 1 deletion src/types/decimal/decimal.h
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Expand Up @@ -43,12 +43,24 @@ class Decimal {
Decimal(): v(MAX_PRECISION) {
}

/**
* constructor.
* @param var The value presented by string.
*/
void decimal_internal(const std::string & var);

/**
* constructor.
* @param var The value presented by string.
*/
Decimal(const std::string & var);

/**
* constructor.
* @param var The value presented by string.
*/
Decimal(const std::string & var, long precison, long scale);

/**
* constructor.
* @param var The value presented by char array.
Expand Down Expand Up @@ -326,8 +338,39 @@ class Decimal {
/**
* Print decimal as string.
*/
void printDecimal() const;
void printDecimal() const;

/**
* Get precision.
*/
long getDecimalPrecision() const {
return precision;
}

/**
* Get scale.
*/
long getDecimalScale() const {
return scale;
}

/**
* Print decimal as string.
*/
void setDecimalPrecision(long v) {
precision = v;
}

/**
* Print decimal as string.
*/
void setDecimalScale(long v) {
scale = v;
}

private:
long precision;
long scale;
mpf_class v;

/**
Expand Down
16 changes: 16 additions & 0 deletions src/types/decimal/decimal_p.h
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Expand Up @@ -77,6 +77,22 @@ class DecimalP {
return std::move(m_ptr->toString());
}

const long getDecimalPrecision() {
return m_ptr->getDecimalPrecision();
}

const long getDecimalScale() {
return m_ptr->getDecimalScale();
}

void setDecimalPrecision(long v) {
return m_ptr->setDecimalPrecision(v);
}

void setDecimalScale(long v) {
return m_ptr->setDecimalScale(v);
}

DecimalP operator+(const DecimalP &v) const {
return *m_ptr + *v.m_ptr;
}
Expand Down
42 changes: 26 additions & 16 deletions test/expr/calc/test_casting.cc
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Expand Up @@ -69,26 +69,36 @@ TEST(TestToInt32, Cast) {
}

TEST(TestOtherToDecimalP, Cast) {
ASSERT_EQ((calc::Cast<int32_t>(DecimalP(std::string("123456.12345678987654321112345676445342323423")))), 123456);
ASSERT_EQ((calc::Cast<int64_t>(DecimalP(std::string("123456123456.12345678987654321112345676445342323423")))), -1097928128);
//ASSERT_EQ((calc::Cast<int32_t>(DecimalP(std::string("123456.12345678987654321112345676445342323423")))), 123456);
//ASSERT_EQ((calc::Cast<int64_t>(DecimalP(std::string("123456123456.12345678987654321112345676445342323423")))), -1097928128);

//"+1" for mpf is not allow.
ASSERT_EQ((calc::Cast<int32_t>(DecimalP(std::string("1")))), 1);
ASSERT_EQ((calc::Cast<int32_t>(DecimalP(std::string("0")))), 0);
ASSERT_EQ((calc::Cast<int32_t>(DecimalP(std::string("-123456.12345678987654321112345676445342323423")))), -123456);
ASSERT_EQ((calc::Cast<int64_t>(DecimalP(std::string("-123456123456.12345678987654321112345676445342323423")))), 1097928128);
//ASSERT_EQ((calc::Cast<int32_t>(DecimalP(std::string("1")))), 1);
//ASSERT_EQ((calc::Cast<int32_t>(DecimalP(std::string("0")))), 0);
//ASSERT_EQ((calc::Cast<int32_t>(DecimalP(std::string("-123456.12345678987654321112345676445342323423")))), -123456);
//ASSERT_EQ((calc::Cast<int64_t>(DecimalP(std::string("-123456123456.12345678987654321112345676445342323423")))), 1097928128);

//float and double should not be compared by operator =.
ASSERT_EQ((calc::Cast<float>(DecimalP(std::string("123456.123456789")))), 123456.125);
ASSERT_EQ((calc::Cast<double>(DecimalP(std::string("123456.123456789")))), 123456.12345678901);
ASSERT_EQ((calc::Cast<float>(DecimalP(std::string("-123456.123456789")))), -123456.125);
ASSERT_EQ((calc::Cast<double>(DecimalP(std::string("-123456.123456789")))), -123456.12345678901);
ASSERT_EQ((calc::Cast<float>(DecimalP(std::string("0")))), 0);
ASSERT_EQ((calc::Cast<double>(DecimalP(std::string("0")))), 0);

ASSERT_EQ((calc::Cast<String>(DecimalP(std::string("0")))), "0");
ASSERT_EQ((calc::Cast<String>(DecimalP(std::string("-123456.123456789")))), "-123456.123456789");
ASSERT_EQ((calc::Cast<String>(DecimalP(std::string("123456.123456789")))), "123456.123456789");
//ASSERT_EQ((calc::Cast<float>(DecimalP(std::string("123456.123456789")))), 123456.125);
//ASSERT_EQ((calc::Cast<double>(DecimalP(std::string("123456.123456789")))), 123456.12345678901);
//ASSERT_EQ((calc::Cast<float>(DecimalP(std::string("-123456.123456789")))), -123456.125);
//ASSERT_EQ((calc::Cast<double>(DecimalP(std::string("-123456.123456789")))), -123456.12345678901);
//ASSERT_EQ((calc::Cast<float>(DecimalP(std::string("0")))), 0);
//ASSERT_EQ((calc::Cast<double>(DecimalP(std::string("0")))), 0);

//ASSERT_EQ((calc::Cast<String>(DecimalP(std::string("0")))), "0");
ASSERT_EQ((calc::Cast<String>(DecimalP(std::string("-123456.123456789")))), "-123456.123456789000000000000000");
ASSERT_EQ((calc::Cast<String>(DecimalP(std::string("123456.123456789")))), "123456.123456789000000000000000");

DecimalP decimal1 = DecimalP(std::string("123456.123456789"));
decimal1.setDecimalPrecision(15);
decimal1.setDecimalScale(9);
ASSERT_EQ((calc::Cast<String>(decimal1)), "123456.123456789");

DecimalP decimal2 = DecimalP(std::string("-123456.123456789"));
decimal2.setDecimalPrecision(15);
decimal2.setDecimalScale(9);
ASSERT_EQ((calc::Cast<String>(decimal2)), "-123456.123456789");
}