Struct datafusion::optimizer::constant_folding::ConstantFolding

pub struct ConstantFolding {}

Optimizer that simplifies comparison expressions involving boolean literals.

Recursively go through all expressionss and simplify the following cases:

• expr = true and expr != false to expr when expr is of boolean type
• expr = false and expr != true to !expr when expr is of boolean type
• true = true and false = false to true
• false = true and true = false to false
• !!expr to expr
• expr = null and expr != null to null

Implementations

impl ConstantFolding

pub fn new() -> Self

Trait Implementations

impl OptimizerRule for ConstantFolding

fn optimize(&self, plan: &LogicalPlan) -> Result<LogicalPlan>

Rewrite plan to an optimized form

fn name(&self) -> &str

A human readable name for this optimizer rule