Module datafusion::physical_plan::udaf

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This module contains functions and structs supporting user-defined aggregate functions.

Structs

AggregateFunctionExpr

Physical aggregate expression of a UDAF.

AggregateUDF

Logical representation of a user-defined aggregate function (UDAF) A UDAF is different from a UDF in that it is stateful across batches.

Functions

create_aggregate_expr

Creates a physical expression of the UDAF, that includes all necessary type coercion. This function errors when args’ can’t be coerced to a valid argument type of the UDAF.