use stmt;
use cratemir;
/// Produces `value` once per row of `input`.
///
/// The input supplies only a cardinality — its rows are never read, and a
/// write that reports just an affected-row count works the same as one that
/// returns rows. Used for a returning clause whose value is fully known
/// client-side (e.g. an UPDATE whose assignments were all literals): the
/// database is not asked for any columns, and the result is the value
/// repeated once per affected row.
pub