void ConditionEncoder::LookupExpressionTransformation()
{
MEASURE_FET("ConditionEncoder::LookupExpressionTransformation(...)");
ExpressionColumn* vcec = dynamic_cast<ExpressionColumn*>(desc->attr.vc);
VirtualColumnBase::VarMap col_desc = vcec->GetLookupCoordinates();
MILookupIterator mit;
mit.Set(NULL_VALUE_64);
desc->encoded = false;
bool null_positive = desc->CheckCondition(mit);
ValueSet valset;
in_type = ColumnType(RC_NUM);
int code = 0;
do {
mit.Set(code);
if(desc->CheckCondition(mit)) {
if(mit.IsValid())
valset.Add64(code);
}
code++;
} while(mit.IsValid());
if(!null_positive) {
PhysicalColumn* col = col_desc.GetTabPtr()->GetColumn(col_desc.col_ndx);
desc->attr.vc = new SingleColumn(col, vcec->GetMultiIndex(), col_desc.var.tab, col_desc.col_ndx, col_desc.GetTabPtr().get(), vcec->GetDim());
desc->attr.vc_id = desc->table->AddVirtColumn(desc->attr.vc);
desc->op = O_IN;
desc->val1.vc = new InSetColumn(in_type, NULL, valset);
desc->val1.vc_id = desc->table->AddVirtColumn(desc->val1.vc);
desc->encoded = true;
} else if(valset.IsEmpty()) {
PhysicalColumn* col = col_desc.GetTabPtr()->GetColumn(col_desc.col_ndx);
desc->attr.vc = new SingleColumn(col, vcec->GetMultiIndex(), col_desc.var.tab, col_desc.col_ndx, col_desc.GetTabPtr().get(), vcec->GetDim());
desc->attr.vc_id = desc->table->AddVirtColumn(desc->attr.vc);
desc->op = O_IS_NULL;
desc->encoded = true;
} else { // both nulls and not-nulls are positive - no single operator possible
// do not encode
desc->encoded = false;
}
}
