void ConditionEncoder::EncodeIfPossible(Descriptor& desc, bool for_rough_query, bool additional_nulls)
{
MEASURE_FET("ConditionEncoder::EncodeIfPossible(...)");
if(desc.done || desc.IsDelayed())
return;
if(desc.IsType_OrTree()) {
desc.tree->root->EncodeIfPossible(for_rough_query, additional_nulls);
desc.Simplify();
return;
}
if(!desc.attr.vc || desc.attr.vc->GetDim() == -1)
return;
SingleColumn* vcsc = (desc.attr.vc->IsSingleColumn() ? static_cast<SingleColumn*>(desc.attr.vc) : NULL);
bool encode_now = false;
if(desc.IsType_AttrAttr() && IsSimpleEqualityOperator(desc.op) && vcsc) {
// special case: simple operator on two compatible numerical columns
SingleColumn* vcsc2 = NULL;
if(desc.val1.vc->IsSingleColumn())
vcsc2 = static_cast<SingleColumn*>(desc.val1.vc);
if(vcsc2 == NULL || vcsc->GetVarMap()[0].GetTabPtr()->TableType() != RC_TABLE ||
vcsc2->GetVarMap()[0].GetTabPtr()->TableType() != RC_TABLE)
return;
if( vcsc->Type().IsString() || vcsc->Type().IsLookup() ||
vcsc2->Type().IsString() || vcsc2->Type().IsLookup()) // excluding strings
return;
bool is_timestamp1 = (vcsc->Type().GetTypeName() == RC_TIMESTAMP);
bool is_timestamp2 = (vcsc2->Type().GetTypeName() == RC_TIMESTAMP);
if(is_timestamp1 || is_timestamp2 && !(is_timestamp1 && is_timestamp2)) // excluding timestamps compared with something else
return;
encode_now =(vcsc->Type().IsDateTime() && vcsc2->Type().IsDateTime()) ||
(vcsc->Type().IsFloat() && vcsc2->Type().IsFloat()) ||
(vcsc->Type().IsFixed() && vcsc2->Type().IsFixed() &&
vcsc->Type().GetScale() == vcsc2->Type().GetScale()); // excluding floats
}
if(!encode_now) {
ExpressionColumn* vcec = dynamic_cast<ExpressionColumn*>(desc.attr.vc);
if(vcec == NULL && (vcsc == NULL || vcsc->GetVarMap()[0].GetTabPtr()->TableType() != RC_TABLE))
return;
if(vcec != NULL) {
encode_now = (vcec->ExactlyOneLookup() &&
(desc.op == O_IS_NULL || desc.op == O_NOT_NULL ||
(desc.val1.vc && desc.val1.vc->IsConst() &&
(desc.val2.vc == NULL || desc.val2.vc->IsConst()))));
} else {
encode_now = (desc.IsType_AttrValOrAttrValVal() ||
desc.IsType_AttrMultiVal() ||
desc.op == O_IS_NULL || desc.op == O_NOT_NULL ) &&
desc.attr.vc->GetVarMap()[0].GetTabPtr()->TableType() == RC_TABLE &&
(!for_rough_query || !desc.IsType_Subquery());
}
}
if(!encode_now)
return;
/////////////////////////////////////////////////////////////////////////////////////
// Encoding itself
ConditionEncoder ce(additional_nulls);
ce(desc);
desc.Simplify();
}
