Module datafusion_physical_expr::functions
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Declaration of built-in (scalar) functions. This module contains built-in functions’ enumeration and metadata.
Generally, a function has:
-
a signature
-
a return type, that is a function of the incoming argument’s types
-
the computation, that must accept each valid signature
-
Signature: see
Signature
-
Return type: a function
(arg_types) -> return_type
. E.g. for sqrt, (f32) -> f32, (f64) -> f64.
This module also has a set of coercion rules to improve user experience: if an argument i32 is passed to a function that supports f64, it is coerced to f64.
Functions
Create a physical (function) expression.
This function errors when args
’ can’t be coerced to a valid argument type of the function.
Create a physical scalar function.
decorates a function to handle ScalarValue
s by converting them to arrays before calling the function
and vice-versa after evaluation.