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1. Implement bit_count() distributed function.

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2. Handle hexadecimal string literals in buildReturnedColumn().
This commit is contained in:
Gagan Goel
2019-11-21 15:32:29 +00:00
parent 6b916675d5
commit 2e16fe674c
4 changed files with 71 additions and 0 deletions
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44
utils/funcexp/func_bitwise.cpp
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@ -359,5 +359,49 @@ int64_t Func_bitxor::getIntVal(Row& row,
}
//
// BIT COUNT
//
CalpontSystemCatalog::ColType Func_bit_count::operationType( FunctionParm& fp, CalpontSystemCatalog::ColType& resultType )
{
return resultType;
}
int64_t Func_bit_count::getIntVal(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType& operationColType)
{
if ( parm.size() != 1 )
{
isNull = true;
return 0;
}
uint64_t val = 0;
if (!getUIntValFromParm(row, parm[0], val, isNull, fTimeZone))
{
std::ostringstream oss;
oss << "bit_count: datatype of " << execplan::colDataTypeToString(operationColType.colDataType);
throw logging::IDBExcept(oss.str(), ERR_DATATYPE_NOT_SUPPORT);
}
// Refer to Hacker's Delight Chapter 5
// for the bit counting algo used here
val = val - ((val >> 1) & 0x5555555555555555);
val = (val & 0x3333333333333333) + ((val >> 2) & 0x3333333333333333);
val = (val + (val >> 4)) & 0x0F0F0F0F0F0F0F0F;
val = val + (val >> 8);
val = val + (val >> 16);
val = val + (val >> 32);
return (int64_t)(val & 0x000000000000007F);
}
} // namespace funcexp
// vim:ts=4 sw=4: