Patent ID: 11868331
Assignee: nan
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 3:
4. The method of claim 1, wherein said constructing the row-index array includes iteratively:
searching the key search tree for the first-table key of each first-table row;
when the first-table key of said each first-table row is found in one of the plurality of nodes of the key search tree:
inserting, into the one of the plurality of row-index elements of the row-index array located at the first-table row position of said each first-table row, the second-table row position stored in said one of the plurality of nodes; and

when the first-table key of said each first-table row is not found in the key search tree,
inserting a null value into the one of the plurality of row-index elements of the row-index array located at the first-table row position of said each first-table row.