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Merge pull request #29 from mariadb-corporation/MCOL-326

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MCOL-326 Fix negative rand seeding
This commit is contained in:
dhall-InfiniDB
2016-10-03 10:31:44 -05:00
committed by GitHub
parent 30e9842508 256c87c6f9
commit a966fa3382
1 changed files with 4 additions and 3 deletions
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7
utils/funcexp/func_rand.cpp
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@@ -65,7 +65,8 @@ double Func_rand::getDoubleVal(rowgroup::Row& row,
bool& isNull,
execplan::CalpontSystemCatalog::ColType& op_ct)
{
int64_t seedParm = 0;
// NOTE: this function needs to use 32bit ints otherwise it will break for negative values
uint32_t seedParm = 0;
// rand with parameter. if the parm is constanct, then a column is attached for fetching
if (parm.size() == 1 || parm.size() == 2)
{
@@ -74,8 +75,8 @@ double Func_rand::getDoubleVal(rowgroup::Row& row,
{
/* Copied from item_func.cpp */
seedParm = parm[0]->data()->getIntVal(row, isNull);
fSeed1 = (uint64_t)(seedParm*0x10001L+55555555L);
fSeed2 = (uint64_t)(seedParm*0x10000001L);
fSeed1 = (uint32_t)(seedParm*0x10001L+55555555L);
fSeed2 = (uint32_t)(seedParm*0x10000001L);
fSeedSet = true;
}
}