Method nullable

datafusion/physical-expr/src/expressions/column.rs:115–118

Decide whether this expression is nullable, given the schema of the input

(&self, input_schema: &Schema)

    /// Decide whether this expression is nullable, given the schema of the input
    fn nullable(&self, input_schema: &Schema) -> Result<bool> {
        self.bounds_check(input_schema)?;
        Ok(input_schema.field(self.index).is_nullable())
    }

    /// Evaluate the expression
    fn evaluate(&self, batch: &RecordBatch) -> Result<ColumnarValue> {