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ReversedUDAF

datafusion_python::datafusion_expr

Enum ReversedUDAF 

Source 
pub enum ReversedUDAF {
    Identical,
    NotSupported,
    Reversed(Arc<AggregateUDF>),
}

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Identical

The expression is the same as the original expression, like SUM, COUNT

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NotSupported

The expression does not support reverse calculation

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Reversed(Arc<AggregateUDF>)

The expression is different from the original expression

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type GuardMut<'a> = MutAs<'a, T, As> where T: 'a

The type of the guard which will clean up the temporary after applying its changes to the original.
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