Struct MergeExpr

pub struct MergeExpr { /* private fields */ }

Merge zero or more expressions that ALL return structs.

If any field names are duplicated, the field from later expressions wins.

NOTE: Fields are not recursively merged, i.e. the later field REPLACES the earlier field. This makes struct fields behaviour consistent with other dtypes.

Implementations

impl MergeExpr

pub fn new(values: Vec<ExprRef>, nullability: Nullability) -> Self

pub fn new_expr(values: Vec<ExprRef>, nullability: Nullability) -> ExprRef

pub fn nullability(&self) -> Nullability

Methods from Deref<Target = dyn VortexExpr>

pub fn id(&self) -> ExprId

pub fn is<V: VTable>(&self) -> bool

pub fn as_<V: VTable>(&self) -> &V::Expr

pub fn as_opt<V: VTable>(&self) -> Option<&V::Expr>

pub fn evaluate(&self, scope: &Scope) -> VortexResult<ArrayRef>

Compute result of expression on given batch producing a new batch

Trait Implementations

impl AnalysisExpr for MergeExpr

fn stat_falsification(&self, _catalog: &mut dyn StatsCatalog) -> Option<ExprRef>

An expression over zone-statistics which implies all records in the zone evaluate to false.

fn max(&self, _catalog: &mut dyn StatsCatalog) -> Option<ExprRef>

An expression for the upper non-null bound of this expression, if available.

fn min(&self, _catalog: &mut dyn StatsCatalog) -> Option<ExprRef>

An expression for the lower non-null bound of this expression, if available.

fn nan_count(&self, _catalog: &mut dyn StatsCatalog) -> Option<ExprRef>

An expression for the NaN count for a column, if available.

fn field_path(&self) -> Option<FieldPath>

impl AsRef<dyn VortexExpr> for MergeExpr

fn as_ref(&self) -> &dyn VortexExpr

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for MergeExpr

fn clone(&self) -> MergeExpr

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MergeExpr

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Deref for MergeExpr

type Target = dyn VortexExpr

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl Display for MergeExpr

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<MergeExpr> for ExprRef

fn from(value: MergeExpr) -> ExprRef

Converts to this type from the input type.

impl Hash for MergeExpr

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IntoExpr for MergeExpr

fn into_expr(self) -> ExprRef

Convert this type into an expression reference.

impl PartialEq for MergeExpr

fn eq(&self, other: &MergeExpr) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for MergeExpr

impl StructuralPartialEq for MergeExpr