8. The method of claim 6 , wherein the datum is stored in the array index as a key-value pair, wherein the value of the key-value pair is the datum, and wherein the key of the key-value pair is based on (i) a path of the datum consistent with the relational schema, (ii) a unique identifier of the first object, and (iii) an index of the datum's location in the array.
10. The method of claim 8 , wherein the key of the key-value pair is further based on a join key.