Function plan_as_of

src/sql/src/plan/query.rs:1004–1015

Plans an expression in the AS OF position of a `SELECT` or `SUBSCRIBE`, or `CREATE MATERIALIZED VIEW` statement.

(
    scx: &StatementContext,
    as_of: Option<AsOf<Aug>>,
)

/// Plans an expression in the AS OF position of a `SELECT` or `SUBSCRIBE`, or `CREATE MATERIALIZED
/// VIEW` statement.
pub fn plan_as_of(
    scx: &StatementContext,
    as_of: Option<AsOf<Aug>>,
) -> Result<QueryWhen, PlanError> {
    match as_of {
        None => Ok(QueryWhen::Immediately),
        Some(as_of) => match as_of {
            AsOf::At(expr) => Ok(QueryWhen::AtTimestamp(plan_as_of_or_up_to(scx, expr)?)),
            AsOf::AtLeast(expr) => Ok(QueryWhen::AtLeastTimestamp(plan_as_of_or_up_to(scx, expr)?)),
        },
    }
}

/// Plans and evaluates a scalar expression in a OneShot context to a non-null MzTimestamp.
///