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How Spark sql query optimisation work if we are using .rdd action ?

HI All, Lets say, we have val df = bigTableA.join(bigTableB,bigTableA("A")===bigTableB("A"),"left") val rddFromDF = df.rdd println(rddFromDF.count) My understanding is that spark will convert all data frame operations before "rddFromDF.count" into RDD equivalent operation as we are not