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class ColumnarRule extends AnyRef

Holds a user defined rule that can be used to inject columnar implementations of various operators in the plan. The preColumnarTransitions Rule can be used to replace SparkPlan instances with versions that support a columnar implementation. After this Spark will insert any transitions necessary. This includes transitions from row to columnar RowToColumnarExec and from columnar to row ColumnarToRowExec. At this point the postColumnarTransitions Rule is called to allow replacing any of the implementations of the transitions or doing cleanup of the plan, like inserting stages to build larger batches for more efficient processing, or stages that transition the data to/from an accelerator's memory.

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  1. new ColumnarRule()

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  15. def postColumnarTransitions: Rule[SparkPlan]
  16. def preColumnarTransitions: Rule[SparkPlan]
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