Waa maxay farqiga u dhaxeeya isku dhafka iyo kala qeybsanaanta marka ay timaado isku dhejinta qeybaha ee Spark
Coalesce wuxuu u qaybiyaa qeybo badan qeybo waaweyn. Marka isticmaal coalesce marka aad rabto inaad yareyso tirada qeybaha (iyo waliba howlaha) adigoon saameyn ku yeelan amarka kala soocida. Tusaale:- marka aad rabto in aad qortid-out hal wax soo saarka file CSV halkii qaybo badan   Isticmaal qeybinta marka aad rabto in aad keento isku shaandheyn taas oo badaleysa tirada qeybaha. Isticmaalka caadiga ah ee dib-u-qaybinta waa in laga saaro kala duwanaanshaha cabbirka faylka ama in lagu bilaabo tiro yar/kala duwan oo ka mid ah qaybaha ka badan tan caadiga ah ee Spark