Method toString

src/QLPredicate.h:348–348

	explicit DistinctPredicate(const std::string& fieldName);
	TypeCode getTypeCode() const override { return TypeCode::DISTINCT; }
	std::string toString() override { return format("(DISTINCT BY : %s)", _fieldName.c_str()); }
	Future<bool> evaluate(Reference<IReadContext> const& context) override;
	bool wantsNulls() override { return false; }