Struct PhysicalExprSimplifier 

pub struct PhysicalExprSimplifier<'a> { /* private fields */ }

Simplifies physical expressions by applying various optimizations

This can be useful after adapting expressions from a table schema to a file schema. For example, casts added to match the types may potentially be unwrapped.

Implementations

impl<'a> PhysicalExprSimplifier<'a>

pub fn new(schema: &'a Schema) -> Self

Create a new physical expression simplifier

pub fn simplify( &mut self, expr: Arc<dyn PhysicalExpr>, ) -> Result<Arc<dyn PhysicalExpr>>

Simplify a physical expression

Trait Implementations

impl<'a> TreeNodeRewriter for PhysicalExprSimplifier<'a>

type Node = Arc<dyn PhysicalExpr>

The node type which is rewritable.

fn f_up(&mut self, node: Self::Node) -> Result<Transformed<Self::Node>>

Invoked while traversing up the tree after all children have been rewritten. Default implementation returns the node as is and continues recursion.

fn f_down( &mut self, node: Self::Node, ) -> Result<Transformed<Self::Node>, DataFusionError>

Invoked while traversing down the tree before any children are rewritten. Default implementation returns the node as is and continues recursion.