To do what when found?
To get the first word in the first cell.
You can iterate through all cells in a row column* and ask the first insertion point of a text cell about its parentTextFrames.id.
If the ID value has changed, the cell is in a different text frame. And so is its row.
In CC-2015 it could be a bit different, because we have a new type of cell: CellTypeEnum.GRAPHIC_TYPE_CELL (no insertionPoints to lead the way).
Duplicate all text frames of the story the table is sitting in and check for the single tables in the duplicates.
Thanks a lot.