1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

//! Samplers for generating an arrow [`StructArray`].

use crate::{array::ArraySampler, generate_validity};
use arrow2::{
    array::{Array, StructArray},
    datatypes::DataType,
};
use sample_std::{Random, Sample};

pub struct StructSampler<V> {
    pub data_type: DataType,
    pub null: Option<V>,
    pub values: Vec<ArraySampler>,
}

impl<V> Sample for StructSampler<V>
where
    V: Sample<Output = bool>,
{
    type Output = Box<dyn Array>;

    fn generate(&self, g: &mut Random) -> Self::Output {
        let values: Vec<_> = self.values.iter().map(|sa| sa.generate(g)).collect();
        let validity = generate_validity(&self.null, g, values[0].len());

        StructArray::new(self.data_type.clone(), values, validity).boxed()
    }
}