Function plan_subscript_array

src/sql/src/plan/query.rs:4388–4410

(
    ecx: &ExprContext,
    expr: HirScalarExpr,
    positions: &[SubscriptPosition<Aug>],
    offset: i64,
)

}

fn plan_subscript_array(
    ecx: &ExprContext,
    expr: HirScalarExpr,
    positions: &[SubscriptPosition<Aug>],
    offset: i64,
) -> Result<CoercibleScalarExpr, PlanError> {
    let mut exprs = Vec::with_capacity(positions.len() + 1);
    exprs.push(expr);

    // Subscripting arrays doesn't yet support slicing, so we always want to
    // extract scalars or error.
    let indexes = extract_scalar_subscript_from_positions(positions, "array")?;

    for i in indexes {
        exprs.push(plan_expr(ecx, i)?.cast_to(
            ecx,
            CastContext::Explicit,
            &SqlScalarType::Int64,
        )?);
    }

    Ok(HirScalarExpr::call_variadic(ArrayIndex { offset }, exprs).into())
}

fn plan_subscript_list(
    ecx: &ExprContext,