Class ExtPathExpression

src/QLExpression.h:55–77

* This expression implements a MongoDB dot-separated path expansion (it returns all subdocuments * patching the given path, expanding arrays as necessary). */

 * patching the given path, expanding arrays as necessary).
 */
struct ExtPathExpression : IExpression, ReferenceCounted<ExtPathExpression>, FastAllocated<ExtPathExpression> {

	Standalone<StringRef> path;
	std::string strPath;
	bool expandLastArray;
	bool imputeNulls;

	void addref() { ReferenceCounted<ExtPathExpression>::addref(); }
	void delref() { ReferenceCounted<ExtPathExpression>::delref(); }

	std::string toString() const override { return "ExtPath(" + strPath + ")"; }

	ExtPathExpression(std::string const& strPath, bool const& expandLastArray, bool const& imputeNulls)
	    : strPath(strPath), expandLastArray(expandLastArray), imputeNulls(imputeNulls) {
		path = encodeMaybeDotted(strPath);
	}

	GenFutureStream<Reference<IReadContext>> evaluate(Reference<IReadContext> const& document) override;

	std::string get_index_key() const override {
		return expandLastArray ? strPath : std::string();
	} // FIXME: a.$n?.b.$n
};

#endif