no error handling when window frame bound node is not required type

[aceforeverd]

OpenMLDB/hybridse/src/node/node_manager.cc

Lines 202 to 208 in bfe5ba6

	SqlNode *NodeManager::MakeFrameBound(BoundType bound_type, ExprNode *expr) {
	if (kExprPrimary != expr->expr_type_) {
	LOG(WARNING) << "cannot create window frame, only support "
	"const number and const time offset of frame";
	return nullptr;
	}
	ConstNode *primary = dynamic_cast<ConstNode *>(expr);

No check for nullptr returns MakeFrameBound, cause seg fault

SQL:

WINDOW w as (.... ROWS BETWEEN id AND CURRENT ROW