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Code Issues

Avoid loosing decimal float precision, scale and/or sign info when sorting

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This commit is contained in:
AlexPeshkoff 2017-03-15 14:42:30 +03:00
parent 0227ec9e3c
commit 0fc68ab8ea
3 changed files with 14 additions and 9 deletions
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14
src/common/DecFloat.cpp
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@ -140,11 +140,17 @@ void make(unsigned int* key,
unsigned dig = digits(pMax, coeff, exp); unsigned dig = digits(pMax, coeff, exp);
// exponent bias and sign // exponent bias and sign
exp += (bias + 2);
if (!dig) if (!dig)
exp = 1; {
exp = 0;
sign = 0;
}
else
{
exp += (bias + 2);
if (sign) if (sign)
exp = -exp; exp = -exp;
}
*key++ = exp; *key++ = exp;
// convert to SLONG // convert to SLONG
@ -171,9 +177,7 @@ void grab(unsigned int* key,
sign = DECFLOAT_Sign; sign = DECFLOAT_Sign;
exp = -exp; exp = -exp;
} }
if (exp == 1) if (exp != 0)
exp = 0;
else
exp -= (bias + 2); exp -= (bias + 2);
// convert from SLONG // convert from SLONG

3
src/jrd/opt.cpp
View File

@ -2453,7 +2453,8 @@ SortedStream* OPT_gen_sort(thread_db* tdbb, CompilerScratch* csb, const StreamLi
fieldNode->getDesc(tdbb, csb, desc); fieldNode->getDesc(tdbb, csb, desc);
// International type text has a computed key // International type text has a computed key
if (IS_INTL_DATA(desc)) // Different decimal float values sometimes have same keys
if (IS_INTL_DATA(desc) || desc->isDecFloat())
break; break;
--items; --items;

2
src/jrd/recsrc/SortedStream.cpp
View File

@ -339,7 +339,7 @@ void SortedStream::mapData(thread_db* tdbb, jrd_req* request, UCHAR* data) const
// a sort key, there is a later nod_field in the item // a sort key, there is a later nod_field in the item
// list that contains the data to send back // list that contains the data to send back
if (IS_INTL_DATA(&item->desc) && if ((IS_INTL_DATA(&item->desc) || item->desc.isDecFloat()) &&
(ULONG)(IPTR) item->desc.dsc_address < m_map->keyLength) (ULONG)(IPTR) item->desc.dsc_address < m_map->keyLength)
{ {
continue; continue;