pub struct UnionScalar<'a> { /* private fields */ }Expand description
A typed view into a DType::Union scalar.
A present union scalar carries a type ID and the raw value of the selected variant. An outer
null union scalar has neither because outer nullness is represented by the enclosing Scalar.
A present union may select a nullable child whose value is an inner null; in that case the union
still has a type ID and Self::is_null returns false.
Implementations§
Source§impl<'a> UnionScalar<'a>
impl<'a> UnionScalar<'a>
Sourcepub fn try_new(
dtype: &'a DType,
value: Option<&'a ScalarValue>,
) -> VortexResult<Self>
pub fn try_new( dtype: &'a DType, value: Option<&'a ScalarValue>, ) -> VortexResult<Self>
Attempts to create a union scalar view from a DType and optional ScalarValue.
A None value represents an outer null union. An inner null is represented by a present
ScalarValue::Union whose selected child value is None.
§Errors
Returns an error if dtype and value do not form a valid union scalar. This includes a
non-union dtype, a null value for a non-nullable union, an unknown type ID, or a value that
is invalid for the selected variant dtype.
Sourcepub fn variants(&self) -> &'a UnionVariants
pub fn variants(&self) -> &'a UnionVariants
Returns the variants of this union scalar.
The variants are part of the dtype and are available even when the union is outer null.
Sourcepub fn nullability(&self) -> Nullability
pub fn nullability(&self) -> Nullability
Returns the outer nullability of this union scalar.
Sourcepub fn is_null(&self) -> bool
pub fn is_null(&self) -> bool
Returns true if this union scalar is outer null.
This does not inspect the selected child. A non-null union containing an inner null child
returns false.
Sourcepub fn type_id(&self) -> Option<u8>
pub fn type_id(&self) -> Option<u8>
Returns the selected type ID, or None if this scalar is outer null.
A non-null union containing an inner null child still returns its selected type ID.
Sourcepub fn child_index(&self) -> Option<usize>
pub fn child_index(&self) -> Option<usize>
Returns the selected variant’s child index, or None if this union is outer null.
A union containing an inner null child is still present and returns Some(index).
Sourcepub fn variant_name(&self) -> Option<&'a FieldName>
pub fn variant_name(&self) -> Option<&'a FieldName>
Returns the selected variant’s name, or None if this union is outer null.
A union containing an inner null child is still present and returns Some(name).
Sourcepub fn variant_dtype(&self) -> Option<DType>
pub fn variant_dtype(&self) -> Option<DType>
Returns the selected variant’s dtype, or None if this union is outer null.
A union containing an inner null child is still present and returns Some(dtype).
Trait Implementations§
Source§impl<'a> Clone for UnionScalar<'a>
impl<'a> Clone for UnionScalar<'a>
Source§fn clone(&self) -> UnionScalar<'a>
fn clone(&self) -> UnionScalar<'a>
1.0.0 (const: unstable) · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moreimpl<'a> Copy for UnionScalar<'a>
Source§impl<'a> Debug for UnionScalar<'a>
impl<'a> Debug for UnionScalar<'a>
Source§impl Display for UnionScalar<'_>
impl Display for UnionScalar<'_>
impl Eq for UnionScalar<'_>
Auto Trait Implementations§
impl<'a> !RefUnwindSafe for UnionScalar<'a>
impl<'a> !UnwindSafe for UnionScalar<'a>
impl<'a> Freeze for UnionScalar<'a>
impl<'a> Send for UnionScalar<'a>
impl<'a> Sync for UnionScalar<'a>
impl<'a> Unpin for UnionScalar<'a>
impl<'a> UnsafeUnpin for UnionScalar<'a>
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