vortex_array/array/varbinview/
accessor.rs

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use std::iter;

use vortex_error::VortexResult;

use crate::accessor::ArrayAccessor;
use crate::array::varbinview::VarBinViewArray;
use crate::validity::Validity;
use crate::IntoArrayVariant;

impl ArrayAccessor<[u8]> for VarBinViewArray {
    fn with_iterator<F: for<'a> FnOnce(&mut dyn Iterator<Item = Option<&'a [u8]>>) -> R, R>(
        &self,
        f: F,
    ) -> VortexResult<R> {
        let bytes = (0..self.buffer_count())
            .map(|i| self.buffer(i))
            .collect::<Vec<_>>();

        let views = self.views();

        match self.validity() {
            Validity::NonNullable | Validity::AllValid => {
                let mut iter = views.iter().map(|view| {
                    if view.is_inlined() {
                        Some(view.as_inlined().value())
                    } else {
                        Some(
                            &bytes[view.as_view().buffer_index() as usize]
                                [view.as_view().to_range()],
                        )
                    }
                });
                Ok(f(&mut iter))
            }
            Validity::AllInvalid => Ok(f(&mut iter::repeat_n(None, views.len()))),
            Validity::Array(v) => {
                let validity_buf = v.into_bool()?.boolean_buffer();
                let mut iter = views.iter().zip(validity_buf.iter()).map(|(view, valid)| {
                    if valid {
                        if view.is_inlined() {
                            Some(view.as_inlined().value())
                        } else {
                            Some(
                                &bytes[view.as_view().buffer_index() as usize]
                                    [view.as_view().to_range()],
                            )
                        }
                    } else {
                        None
                    }
                });
                Ok(f(&mut iter))
            }
        }
    }
}