Module datafusion_expr::function
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Function module contains typing and signature for built-in and user defined functions.
Functions
Returns the datatype of the scalar function
the signatures supported by the function fun.
Type Definitions
Factory that returns an accumulator for the given aggregate, given its return datatype.
Factory that returns the functions’s return type given the input argument types
Scalar function
Factory that returns the types used by an aggregator to serialize its state, given its return datatype.