Trait datafusion_physical_expr::PhysicalExpr

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pub trait PhysicalExpr: Send + Sync + Display + Debug + PartialEq<dyn Any> {
    // Required methods
    fn as_any(&self) -> &dyn Any;
    fn data_type(&self, input_schema: &Schema) -> Result<DataType>;
    fn nullable(&self, input_schema: &Schema) -> Result<bool>;
    fn evaluate(&self, batch: &RecordBatch) -> Result<ColumnarValue>;
    fn children(&self) -> Vec<Arc<dyn PhysicalExpr>> ⓘ;
    fn with_new_children(
        self: Arc<Self>,
        children: Vec<Arc<dyn PhysicalExpr>>
    ) -> Result<Arc<dyn PhysicalExpr>>;

    // Provided methods
    fn evaluate_selection(
        &self,
        batch: &RecordBatch,
        selection: &BooleanArray
    ) -> Result<ColumnarValue> { ... }
    fn analyze(&self, context: AnalysisContext) -> AnalysisContext { ... }
}
Expand description

Expression that can be evaluated against a RecordBatch A Physical expression knows its type, nullability and how to evaluate itself.

Required Methods§

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fn as_any(&self) -> &dyn Any

Returns the physical expression as Any so that it can be downcast to a specific implementation.

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fn data_type(&self, input_schema: &Schema) -> Result<DataType>

Get the data type of this expression, given the schema of the input

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fn nullable(&self, input_schema: &Schema) -> Result<bool>

Determine whether this expression is nullable, given the schema of the input

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fn evaluate(&self, batch: &RecordBatch) -> Result<ColumnarValue>

Evaluate an expression against a RecordBatch

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fn children(&self) -> Vec<Arc<dyn PhysicalExpr>> ⓘ

Get a list of child PhysicalExpr that provide the input for this expr.

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fn with_new_children( self: Arc<Self>, children: Vec<Arc<dyn PhysicalExpr>> ) -> Result<Arc<dyn PhysicalExpr>>

Returns a new PhysicalExpr where all children were replaced by new exprs.

Provided Methods§

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fn evaluate_selection( &self, batch: &RecordBatch, selection: &BooleanArray ) -> Result<ColumnarValue>

Evaluate an expression against a RecordBatch after first applying a validity array

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fn analyze(&self, context: AnalysisContext) -> AnalysisContext

Return the boundaries of this expression. This method (and all the related APIs) are experimental and subject to change.

Implementors§