vortex_schema/
lib.rs

1use vortex_dtype::field::Field;
2use vortex_dtype::DType;
3use vortex_error::{vortex_bail, vortex_err, VortexResult};
4
5use self::projection::Projection;
6
7pub mod projection;
8
9#[derive(Clone, Debug)]
10pub struct Schema(pub(crate) DType);
11
12impl Schema {
13    pub fn new(schema_dtype: DType) -> Self {
14        Self(schema_dtype)
15    }
16
17    pub fn project(&self, projection: Projection) -> VortexResult<Self> {
18        match projection {
19            Projection::All => Ok(self.clone()),
20            Projection::Flat(fields) => {
21                let DType::Struct(s, n) = &self.0 else {
22                    vortex_bail!("Can't project non struct types")
23                };
24                s.project(fields.as_ref())
25                    .map(|p| Self(DType::Struct(p, *n)))
26            }
27        }
28    }
29
30    pub fn dtype(&self) -> &DType {
31        &self.0
32    }
33
34    pub fn field_type(&self, field: &Field) -> VortexResult<DType> {
35        let DType::Struct(s, _) = &self.0 else {
36            vortex_bail!("Can't project non struct types")
37        };
38
39        let idx = match field {
40            Field::Name(name) => s.find_name(name),
41            Field::Index(i) => Some(*i),
42        };
43
44        idx.and_then(|idx| s.dtypes().get(idx).cloned())
45            .ok_or_else(|| vortex_err!("Couldn't find field {field}"))
46    }
47}
48
49impl From<Schema> for DType {
50    fn from(value: Schema) -> Self {
51        value.0
52    }
53}
vortex_schema/lib.rs

vortex_schema/
lib.rs
