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simplify_const_expr

datafusion_physical_expr::simplifier::const_evaluator

Function simplify_const_expr 

Source 
pub fn simplify_const_expr(
    expr: Arc<dyn PhysicalExpr>,
) -> Result<Transformed<Arc<dyn PhysicalExpr>>>
👎Deprecated since 53.0.0:

This function will be removed in a future release in favor of a private implementation that depends on other implementation details. Please open an issue if you have a use case for keeping it.

Expand description

Simplify expressions that consist only of literals by evaluating them.

This function checks if all children of the given expression are literals. If so, it evaluates the expression against a dummy RecordBatch and returns the result as a new Literal.

§Example transformations

  • 1 + 2 -> 3
  • (1 + 2) * 3 -> 9 (with bottom-up traversal)
  • 'hello' || ' world' -> 'hello world'