Method slice

arrow-array/src/array/union_array.rs:331–352

Returns a zero-copy slice of this array with the indicated offset and length.

(&self, offset: usize, length: usize)

    /// Returns a zero-copy slice of this array with the indicated offset and length.
    pub fn slice(&self, offset: usize, length: usize) -> Self {
        let (offsets, fields) = match self.offsets.as_ref() {
            // If dense union, slice offsets
            Some(offsets) => (Some(offsets.slice(offset, length)), self.fields.clone()),
            // Otherwise need to slice sparse children
            None => {
                let fields = self
                    .fields
                    .iter()
                    .map(|x| x.as_ref().map(|x| x.slice(offset, length)))
                    .collect();
                (None, fields)
            }
        };

        Self {
            data_type: self.data_type.clone(),
            type_ids: self.type_ids.slice(offset, length),
            offsets,
            fields,
        }
    }

    /// Deconstruct this array into its constituent parts
    ///