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What is the difference between 'Hive on Spark mode' and 'Spark SQL'?

What is the difference between 'Hive on Spark mode' and 'Spark SQL'?

New Contributor

Will 'Hive on Spark mode' uses Catalyst Optimizer?

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

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