Consolidate find_with_* result with HashMap

[billy1624]

Motivation

Currently, find_with_* method will produce a query like below, where ORDER BY is required to make sure it's in proper order to be consolidated.

SELECT `container`.`db_id` AS `A_db_id`, `content`.`id` AS `B_id`, `content`.`container_id` AS `B_container_id`
FROM `container`
LEFT JOIN `content` ON `container`.`db_id` = `content`.`container_id`
ORDER BY `container`.`db_id` ASC

The consolidation logic is defined at

sea-orm/src/executor/select.rs

Lines 993 to 1027 in 986f0c2

	fn consolidate_query_result<L, R>(
	rows: Vec<(L::Model, Option<R::Model>)>,
	) -> Vec<(L::Model, Vec<R::Model>)>
	where
	L: EntityTrait,
	R: EntityTrait,
	{
	let mut acc: Vec<(L::Model, Vec<R::Model>)> = Vec::new();
	for (l, r) in rows {
	if let Some((last_l, last_r)) = acc.last_mut() {
	let mut same_l = true;
	for pk_col in <L::PrimaryKey as Iterable>::iter() {
	let col = pk_col.into_column();
	let val = l.get(col);
	let last_val = last_l.get(col);
	if !val.eq(&last_val) {
	same_l = false;
	break;
	}
	}
	if same_l {
	if let Some(r) = r {
	last_r.push(r);
	continue;
	}
	}
	}
	let rows = match r {
	Some(r) => vec![r],
	None => vec![],
	};
	acc.push((l, rows));
	}
	acc
	}

[billy1624]

Closed by #1743