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Handle comparison of two negative TIME values properly in the ORDER BY clause.

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This commit is contained in:
Gagan Goel
2019-10-08 10:23:56 -04:00
parent 1af0248ae5
commit 6207d6137d
2 changed files with 65 additions and 1 deletions
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57
utils/windowfunction/idborderby.cpp
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@ -237,6 +237,55 @@ int LongDoubleCompare::operator()(IdbCompare* l, Row::Pointer r1, Row::Pointer r
}
int TimeCompare::operator()(IdbCompare* l, Row::Pointer r1, Row::Pointer r2)
{
l->row1().setData(r1);
l->row2().setData(r2);
bool b1 = l->row1().isNullValue(fSpec.fIndex);
bool b2 = l->row2().isNullValue(fSpec.fIndex);
int ret = 0;
if (b1 == true || b2 == true)
{
if (b1 == false && b2 == true)
ret = fSpec.fNf;
else if (b1 == true && b2 == false)
ret = -fSpec.fNf;
}
else
{
int64_t v1 = l->row1().getIntField(fSpec.fIndex);
int64_t v2 = l->row2().getIntField(fSpec.fIndex);
// ((int64_t) -00:00:26) > ((int64_t) -00:00:25)
// i.e. For 2 negative TIME values, we invert the order of
// comparison operations to force "-00:00:26" to appear before
// "-00:00:25" in ascending order.
if (v1 < 0 && v2 < 0)
{
// Unset the MSB.
v1 &= ~(1ULL << 63);
v2 &= ~(1ULL << 63);
if (v1 < v2)
ret = fSpec.fAsc;
else if (v1 > v2)
ret = -fSpec.fAsc;
}
else
{
if (v1 > v2)
ret = fSpec.fAsc;
else if (v1 < v2)
ret = -fSpec.fAsc;
}
}
return ret;
}
bool CompareRule::less(Row::Pointer r1, Row::Pointer r2)
{
for (vector<Compare*>::iterator i = fCompares.begin(); i != fCompares.end(); i++)
@ -268,7 +317,6 @@ void CompareRule::compileRules(const std::vector<IdbSortSpec>& spec, const rowgr
case CalpontSystemCatalog::BIGINT:
case CalpontSystemCatalog::DECIMAL:
case CalpontSystemCatalog::UDECIMAL:
case CalpontSystemCatalog::TIME:
{
Compare* c = new IntCompare(*i);
fCompares.push_back(c);
@ -326,6 +374,13 @@ void CompareRule::compileRules(const std::vector<IdbSortSpec>& spec, const rowgr
break;
}
case CalpontSystemCatalog::TIME:
{
Compare* c = new TimeCompare(*i);
fCompares.push_back(c);
break;
}
default:
{
break;