expression::AbstractExpression *ExprTransformer::TransformConst(
const Expr *es) {
auto const_expr = reinterpret_cast<const Const *>(es);
Value value;
if (const_expr->constisnull) { // Constant is null
value = ValueFactory::GetNullValue();
} else if (const_expr->constbyval) { // non null
value = TupleTransformer::GetValue(const_expr->constvalue,
const_expr->consttype);
} else if (const_expr->constlen == -1) {
LOG_TRACE("Probably handing a string constant ");
value = TupleTransformer::GetValue(const_expr->constvalue,
const_expr->consttype);
} else {
LOG_ERROR(
"Unknown Const profile: constlen = %d , constbyval = %d, constvalue = "
"%lu ",
const_expr->constlen, const_expr->constbyval,
(long unsigned)const_expr->constvalue);
}
// A Const Expr has no children.
if (const_expr->consttype == POSTGRES_VALUE_TYPE_TEXT_ARRAY ||
const_expr->consttype == POSTGRES_VALUE_TYPE_INT2_ARRAY ||
const_expr->consttype == POSTGRES_VALUE_TYPE_INT4_ARRAY ||
const_expr->consttype == POSTGRES_VALUE_TYPE_FLOADT4_ARRAY ||
const_expr->consttype == POSTGRES_VALUE_TYPE_OID_ARRAY ||
const_expr->consttype == POSTGRES_VALUE_TYPE_BPCHAR2) {
std::vector<expression::AbstractExpression *> vec_exprs;
Value tmp_value;
int vector_length = value.ArrayLength();
for (int i = 0; i < vector_length; i++) {
tmp_value = value.ItemAtIndex(i);
std::string str = tmp_value.GetInfo();
expression::AbstractExpression *ce =
expression::ExpressionUtil::ConstantValueFactory(tmp_value);
vec_exprs.push_back(ce);
}
// TODO: The following line is wrong. The first argument should be the
// the element type
auto rv =
expression::ExpressionUtil::VectorFactory(VALUE_TYPE_ARRAY, vec_exprs);
return rv;
} else {
auto rv = expression::ExpressionUtil::ConstantValueFactory(value);
return rv;
}
}
