Module datafusion::physical_plan::aggregates

Aggregates functionalities

Structs

• AggregateExec
  Hash aggregate execution plan
• PhysicalGroupBy
  Represents GROUP BY clause in the plan (including the more general GROUPING SET) In the case of a simple GROUP BY a, b clause, this will contain the expression [a, b] and a single group [false, false]. In the case of GROUP BY GROUPING SET/CUBE/ROLLUP the planner will expand the expression into multiple groups, using null expressions to align each group. For example, with a group by clause GROUP BY GROUPING SET ((a,b),(a),(b)) the planner should create a PhysicalGroupBy like PhysicalGroupBy { expr: [(col(a), a), (col(b), b)], null_expr: [(NULL, a), (NULL, b)], groups: [ [false, false], // (a,b) [false, true], // (a) <=> (a, NULL) [true, false] // (b) <=> (NULL, b) ] }

Enums

• AggregateFunction
  Enum of all built-in aggregate functions
• AggregateMode
  Hash aggregate modes
• GroupByOrderMode
  Group By expression modes

Functions

• create_aggregate_expr
  Create a physical aggregation expression. This function errors when input_phy_exprs’ can’t be coerced to a valid argument type of the aggregation function.