// change literals of a cacheable query into ConstantParameters
ItemExpr* UDFunction::normalizeForCache(CacheWA& cwa, BindWA& bindWA)
{
if (nodeIsNormalizedForCache()) {
return this;
}
// Since the UDFunction::transformNode refers to both the
// inputVars_ ValueIdSet and the children array we need to make sure
// they are consistent.
// The children array may contain cast() of the expressions in inputVars_
// If we have a UUDF function the inputs that were given
// at parse time, really do not reflect reality anymore.
// So here we will simply reinitialize them with what we find in the
// inputVars_.
CMPASSERT(udfDesc_); // we better have one after binding.
NABoolean isUUDF(udfDesc_->isUUDFRoutine());
// Save off a copy of the original inputVars_ set.
ValueIdSet origInputVars(inputVars_);
// Loop through the given inputs
for (Int32 x = 0; x < getArity(); x++)
{
NABoolean origInputIsChildOfCast(FALSE);
ItemExpr * origIe = child(x);
ItemExpr * newIe = NULL;
ValueId vid = origIe->getValueId();
if (cwa.getPhase() == CmpMain::BIND)
{
if (origIe->isSafelyCoercible(cwa))
{
// fix CR 10-010726-4109: make sure queries with constants that
// cannot be safely backpatched such as
// select case smallintcol when 4294967393 then 'max' end from t
// are not parameterized
newIe = origIe->normalizeForCache(cwa, bindWA);
if (newIe != origIe )
{
// normalizeForCache returned a new ItemExpr. We have to update
// the UDFunction inputVars_ set, as this is used to determine
// characteristic inputs for IsolatedScalarUDF at transform time.
child(x) = newIe;
// Is it a input that UDFunction::bindNode put a cast around?
if ((origIe->getOperatorType() == ITM_CAST) &&
(origInputVars.contains(origIe->child(0)->getValueId())))
{
// Since the original child was a CAST that UDFunction::bindNode
// created, check to see if that CAST's child is part of the new
// expression, if it is, we don't have to do anything, since the
// CASTED value is part of the inputVars set, otherwise, we have
// to update the inputVars set to keep the characteristic inputs
// consistent.
if (! newIe->referencesTheGivenValue(
origIe->child(0)->getValueId()), TRUE)
{
// remove the original input from inputVars. It is the child
// of origIe because origIe is a cast that UDFunction::bindNode
// introduced.
inputVars_ -= origIe->child(0)->getValueId();
if (newIe->getOperatorType() == ITM_CAST)
{
// If the new expression is a CAST, we assume the child is the
// real input. We don't expect CAST(CAST(CAST(expr))) type
// expressions only simple CAST(expr) ones.
inputVars_ += newIe->child(0)->getValueId();
}
else
{
// add the newIe itself if it was not a CAST.
inputVars_ += newIe->getValueId();
}
}
}
else
{
// If the newIe doesn't contain the original one, we need to update
// the inputVars set.
if (! newIe->referencesTheGivenValue(
origIe->getValueId()), TRUE)
{
// the origIe was not a CAST introduced by UDFunction::bindNode()
if (newIe->getOperatorType() == ITM_CAST)
{
if (!origInputVars.contains(newIe->child(0)->getValueId()))
{
inputVars_ -= origIe->getValueId();
// If the new expression is a CAST, we assume the child is the
// real input. We don't expect CAST(CAST(CAST(expr))) type
// expressions only simple CAST(expr) ones.
inputVars_ += newIe->child(0)->getValueId();
}
// we don't need to update inputVars_ if the origInputVars
// contains the valueId of the newIe child already.
}
else
{
// This is an entirely new input. Remove the old one, and
// add in the new.
inputVars_ -= origIe->getValueId();
inputVars_ += newIe->getValueId();
}
}
}
}
}
}
}
markAsNormalizedForCache();
return this;
}
