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only_or_err in datafusion_optimizer::utils - Rust
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Function datafusion_optimizer::utils::only_or_err

source · [−]
pub fn only_or_err<T>(slice: &[T]) -> Result<&T>
Expand description

Returns the first (and only) element in a slice, or an error

Arguments

  • slice - The slice to extract from

Return value

The first element, or an error