SparkStrategies — Container of Execution Planning Strategies

SparkStrategies is an abstract Catalyst query planner that merely serves as a "container" (or a namespace) of the concrete execution planning strategies (for SparkPlanner):

SparkStrategies has a single lazily-instantiated singleRowRdd value that is an RDD of InternalRow that BasicOperators execution planning strategy uses when converting OneRowRelation to RDDScanExec physical operator.

OneRowRelation logical operator represents SQL’s SELECT clause without FROM clause or EXPLAIN DESCRIBE TABLE.

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