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What is the difference between 'Hive on Spark mode' and 'Spark SQL'? Will 'Hive on Spark mode' uses Catalyst Optimizer?

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What is the difference between 'Hive on Spark mode' and 'Spark SQL'? Will 'Hive on Spark mode' uses Catalyst Optimizer?

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- Hive on Spark mode vs MR mode - Spark SQL - Catalyst Optimizer/RDD/Tungsten