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
- Return the
Signature
supported by the functionfun
.
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.