Enum mz_sql::plan::query::QueryLifetime

pub enum QueryLifetime {
    OneShot,
    Index,
    MaterializedView,
    Subscribe,
    View,
    Source,
}

Specifies how long a query will live.

Variants

OneShot

The query’s (or the expression’s) result will be computed at one point in time.

Index

The query (or expression) is used in a dataflow that maintains an index.

MaterializedView

The query (or expression) is used in a dataflow that maintains a materialized view.

Subscribe

The query (or expression) is used in a dataflow that maintains a SUBSCRIBE.

View

The query (or expression) is part of a (non-materialized) view.

Source

The expression is part of a source definition.

Implementations

impl QueryLifetime

pub fn is_one_shot(&self) -> bool

(This used to impact whether the query is allowed to reason about the time at which it is running, e.g., by calling the now() function. Nowadays, this is decided by a different mechanism, see ExprPrepStyle.)

pub fn is_maintained(&self) -> bool

Maintained dataflows can’t have a finishing applied directly. Therefore, the finishing is turned into a TopK.

pub fn allow_show(&self) -> bool

Most maintained dataflows don’t allow SHOW commands currently. However, SUBSCRIBE does.

Trait Implementations

impl Clone for QueryLifetime

fn clone(&self) -> QueryLifetime

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for QueryLifetime

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for QueryLifetime

fn eq(&self, other: &QueryLifetime) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for QueryLifetime

impl Eq for QueryLifetime

impl StructuralPartialEq for QueryLifetime