Module datafusion_expr::function

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

Functions

• return_typeDeprecated
  Returns the datatype of the scalar function
• signatureDeprecated
  Return the Signature supported by the function fun.
• suggest_valid_function
  Suggest a valid function based on an invalid input function name

Type Definitions

• AccumulatorFactoryFunction
  Factory that returns an accumulator for the given aggregate, given its return datatype.
• 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.