Function datafusion_physical_expr::utils::normalize_out_expr_with_alias_schema

source · 
pub fn normalize_out_expr_with_alias_schema(
    expr: Arc<dyn PhysicalExpr>,
    alias_map: &HashMap<Column, Vec<Column>>,
    schema: &SchemaRef
) -> Arc<dyn PhysicalExpr>
Expand description

Normalize the output expressions based on Alias Map and SchemaRef.

  1. If there is mapping in Alias Map, replace the Column in the output expressions with the 1st Column in Alias Map
  2. If the Column is invalid for the current Schema, replace the Column with a place holder UnKnownColumn