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.

Adds a new key for the relation.

Computes the number of columns in the relation.

Gets the index of the columns used when creating a default index.

Trait Implementations

The type of parameters that arbitrary_with accepts for configuration of the generated Strategy. Parameters must implement Default. Read more
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Auto Trait Implementations

Blanket Implementations

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Compare self to key and return true if they are equal.

Returns the argument unchanged.

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