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org.apache.spark.sql.catalyst.planning

PhysicalAggregation

object PhysicalAggregation

An extractor used when planning the physical execution of an aggregation. Compared with a logical aggregation, the following transformations are performed:

  • Unnamed grouping expressions are named so that they can be referred to across phases of aggregation
  • Aggregations that appear multiple times are deduplicated.
  • The computation of the aggregations themselves is separated from the final result. For example, the count in count + 1 will be split into an AggregateExpression and a final computation that computes count.resultAttribute + 1.
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  1. type ReturnType = (Seq[NamedExpression], Seq[Expression], Seq[NamedExpression], LogicalPlan)

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