Module datafusion_expr::function

Function module contains typing and signature for built-in and user defined functions.

Structs

• AccumulatorArgs
  AccumulatorArgs contains information about how an aggregate function was called, including the types of its arguments and any optional ordering expressions.
• StateFieldsArgs
  StateFieldsArgs contains information about the fields that an aggregate function’s accumulator should have. Used for AggregateUDFImpl::state_fields.

Enums

• Hint

Type Aliases

• AccumulatorFactoryFunction
  Factory that returns an accumulator for the given aggregate function.
• AggregateFunctionSimplification
  crate::udaf::AggregateUDFImpl::simplify simplifier closure A closure with two arguments:
• PartitionEvaluatorFactory
  Factory that creates a PartitionEvaluator for the given window function
• ReturnTypeFunction
  Factory that returns the functions’s return type given the input argument types
• ScalarFunctionImplementation
  Scalar function
• StateTypeFunction
  Factory that returns the types used by an aggregator to serialize its state, given its return datatype.
• WindowFunctionSimplification
  crate::udwf::WindowUDFImpl::simplify simplifier closure A closure with two arguments: