datafusion_python::optimizer::utils

Function evaluates_to_null

Source 
pub fn evaluates_to_null<'a>(
    predicate: Expr,
    null_columns: impl IntoIterator<Item = &'a Column>,
) -> Result<bool, DataFusionError>
Expand description

Determines if an expression will always evaluate to null. c0 + 8 return true c0 IS NULL return false CASE WHEN c0 > 1 then 0 else 1 return false