src/FACTFinder/Adapter/Compare.php
public function getComparableAttributes()
    {
        if (is_null($this->comparableAttributes)
            || !$this->upToDate
        ) {
            $this->comparableAttributes = $this->createComparableAttributes();
            $this->upToDate = true;
        }

        return $this->comparableAttributes;
    }
public function getComparableAttributes()
    {
        if (is_null($this->comparableAttributes)
            || !$this->upToDate
        ) {
            $this->comparableAttributes = $this->createComparableAttributes();
            $this->upToDate = true;
        }

        return $this->comparableAttributes;
    }
Returns the attributes which can be compared and whether the products in
question differ in each of those attributes. If no IDs have been set,
there will be a warning raised and an empty array will be returned.

@return bool[] Attribute names as keys, boolean value indicates whether
products have different values for this attribute.