Module common_query::logical_plan::accumulator

Accumulator module contains the trait definition for aggregation function’s accumulators.

Structs

• DfAccumulatorAdaptor
  A wrapper type for our Accumulator to DataFusion’s Accumulator, so to make our Accumulator able to be executed by DataFusion query engine.

Traits

• Accumulator
  An accumulator represents a stateful object that lives throughout the evaluation of multiple rows and generically accumulates values.
• AggrFuncTypeStore
  AggrFuncTypeStore stores the aggregate function’s input data’s types.
• AggregateFunctionCreator
  An AggregateFunctionCreator dynamically creates Accumulator.

Functions

• make_accumulator_function
• make_return_function
• make_state_function

Type Aliases

• AggregateFunctionCreatorRef