medium10 pts · first answer countssparkspark-joins

When Spark broadcasts on its own

Without any hint, when does Spark plan a broadcast hash join for a join between two tables?

A.Whenever one side has fewer than one million rowsB.Only when both tables are cached in memory firstC.When one side is estimated under 10 MB, the default thresholdD.Only for joins written in Spark SQL, not DataFrame code

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When Spark broadcasts on its own

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