datasources 0.1.5

Async datasource interfaces, middleware, registry, and test doubles
Documentation 
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use crate::value::Value;
use std::collections::HashMap;

pub type MappedRow = HashMap<String, MappedValue>;

#[derive(Clone, Debug, PartialEq)]
pub enum MappedValue {
    Cell(Value),
    Many(Vec<MappedRow>),
}