Trait spacetimedb_lib::relation::Relation

source · 
pub trait Relation {
    // Required methods
    fn head(&self) -> Header;
    fn row_count(&self) -> RowCount;
}
Expand description

A Relation is anything that could be represented as a Header of [ColumnName:ColumnType] that generates rows/tuples of AlgebraicValue that exactly match that Header.

Required Methods§

source

fn head(&self) -> Header

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fn row_count(&self) -> RowCount

Specify the size in rows of the Relation.

Warning: It should at least be precise in the lower-bound estimate.

Implementors§