Function execute_offset_statement

crates/gitql-engine/src/engine_executor.rs:297–328

(
    env: &mut Environment,
    statement: &OffsetStatement,
    gitql_object: &mut GitQLObject,
)

}

fn execute_offset_statement(
    env: &mut Environment,
    statement: &OffsetStatement,
    gitql_object: &mut GitQLObject,
) -> Result<(), String> {
    if gitql_object.is_empty() {
        return Ok(());
    }

    if gitql_object.len() > 1 {
        gitql_object.flat()
    }

    let main_group: &mut Group = &mut gitql_object.groups[0];
    let start = &evaluate_expression(
        env,
        &statement.start,
        &gitql_object.titles,
        &main_group.rows[0].values,
    )?;

    // If start evaluates to NULL, it is treated the same as OFFSET 0
    if start.is_null() {
        return Ok(());
    }

    let offset = start.as_int().unwrap() as usize;
    let main_group: &mut Group = &mut gitql_object.groups[0];
    main_group.rows.drain(0..cmp::min(offset, main_group.len()));

    Ok(())
}

fn execute_aggregation_functions_statement(
    env: &mut Environment,