how fetch value another quarrel within same information pipleline?


i have information hallowed several transformations information complete, problem there parent/child charge managed information - best explained an example



each quarrel (column names finished up)



row_key    parent_row_key   row_name    parent_row_name


some rows have row_key == parent_row_key (their possess parent)
some rows news another row
(row 25 progenitor quarrel 44 example).



in case, quarrel 25 progenitor quarrel 44. i need put quarrel 25's row_name quarrel 44's parent_row_name. i query information tube value?



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