Struct repr::relation::RelationType [−][src]
pub struct RelationType {
pub column_types: Vec<ColumnType>,
pub keys: Vec<Vec<usize>>,
}
Expand description
The type of a relation.
Fields
column_types: Vec<ColumnType>
The type for each column, in order.
keys: Vec<Vec<usize>>
Sets of indices that are “keys” for the collection.
Each element in this list is a set of column indices, each with the property that the collection contains at most one record with each distinct set of values for each column. Alternately, for a specific set of values assigned to the these columns there is at most one record.
A collection can contain multiple sets of keys, although it is common to have either zero or one sets of key indices.
Implementations
Constructs a RelationType
representing the relation with no columns and
no keys.
Constructs a new RelationType
from specified column types.
The RelationType
will have no keys.
Trait Implementations
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
Adds names and types of the fields of the struct or enum to rti
. Read more
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
This method tests for !=
.
Auto Trait Implementations
impl RefUnwindSafe for RelationType
impl Send for RelationType
impl Sync for RelationType
impl Unpin for RelationType
impl UnwindSafe for RelationType
Blanket Implementations
Mutably borrows from an owned value. Read more
Compare self to key
and return true
if they are equal.
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more