Function plan_list

src/sql/src/plan/query.rs:5018–5053

(
    ecx: &ExprContext,
    exprs: &[Expr<Aug>],
    type_hint: Option<&SqlScalarType>,
)

}

fn plan_list(
    ecx: &ExprContext,
    exprs: &[Expr<Aug>],
    type_hint: Option<&SqlScalarType>,
) -> Result<CoercibleScalarExpr, PlanError> {
    let (elem_type, exprs) = if exprs.is_empty() {
        if let Some(SqlScalarType::List { element_type, .. }) = type_hint {
            (element_type.without_modifiers(), vec![])
        } else {
            sql_bail!("cannot determine type of empty list");
        }
    } else {
        let type_hint = match type_hint {
            Some(SqlScalarType::List { element_type, .. }) => Some(&**element_type),
            _ => None,
        };

        let mut out = vec![];
        for expr in exprs {
            out.push(match expr {
                // Special case nested LIST expressions so we can plumb
                // the type hint through.
                Expr::List(exprs) => plan_list(ecx, exprs, type_hint)?,
                _ => plan_expr(ecx, expr)?,
            });
        }
        let out = coerce_homogeneous_exprs(&ecx.with_name("LIST"), out, type_hint)?;
        (ecx.scalar_type(&out[0]).without_modifiers(), out)
    };

    if matches!(elem_type, SqlScalarType::Char { .. }) {
        bail_unsupported!("char list");
    }

    Ok(HirScalarExpr::call_variadic(ListCreate { elem_type }, exprs).into())
}

fn plan_map(
    ecx: &ExprContext,