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	-- SWH DB schema upgrade
	-- from_version: 33
	-- to_version: 34
	-- description: update swh_revision_list{,children} with limits and parents

	insert into dbversion(version, release, description)
	values(34, now(), 'Work In Progress');

	DROP FUNCTION swh_revision_list(root_revision sha1_git);

	DROP FUNCTION swh_revision_list_children(root_revision sha1_git);

	DROP FUNCTION swh_revision_log(root_revision sha1_git);

	CREATE OR REPLACE FUNCTION swh_revision_list(root_revision sha1_git, num_revs bigint = NULL::bigint) RETURNS TABLE(id sha1_git, parents bytea[])
	LANGUAGE sql STABLE
	AS $$
	with recursive rev_list(id) as (
	(select id from revision where id = root_revision)
	union
	(select parent_id
	from revision_history as h
	join rev_list on h.id = rev_list.id)
	)
	select rev_list.id as id, array_agg(rh.parent_id::bytea order by rh.parent_rank) as parent from rev_list
	left join revision_history rh on rev_list.id = rh.id
	group by rev_list.id
	limit num_revs;
	$$;

	CREATE OR REPLACE FUNCTION swh_revision_list_children(root_revision sha1_git, num_revs bigint = NULL::bigint) RETURNS TABLE(id sha1_git, parents bytea[])
	LANGUAGE sql STABLE
	AS $$
	with recursive rev_list(id) as (
	(select id from revision where id = root_revision)
	union
	(select h.id
	from revision_history as h
	join rev_list on h.parent_id = rev_list.id)
	)
	select rev_list.id as id, array_agg(rh.parent_id::bytea order by rh.parent_rank) as parent from rev_list
	left join revision_history rh on rev_list.id = rh.id
	group by rev_list.id
	limit num_revs;
	$$;

	CREATE OR REPLACE FUNCTION swh_revision_log(root_revision sha1_git, num_revs bigint = NULL::bigint) RETURNS SETOF revision_entry
	LANGUAGE sql STABLE
	AS $$
	select t.id, r.date, r.date_offset,
	r.committer_date, r.committer_date_offset,
	r.type, r.directory, r.message,
	a.name, a.email, c.name, c.email, r.metadata, r.synthetic,
	t.parents
	from swh_revision_list(root_revision, num_revs) as t
	left join revision r on t.id = r.id
	left join person a on a.id = r.author
	left join person c on c.id = r.committer;
	$$;

	CREATE OR REPLACE FUNCTION swh_revision_find_occurrence(revision_id sha1_git) RETURNS occurrence
	LANGUAGE sql STABLE
	AS $$
	select origin, branch, revision
	from swh_revision_list_children(revision_id) as rev_list
	left join occurrence_history occ_hist
	on rev_list.id = occ_hist.revision
	where occ_hist.origin is not null
	order by upper(occ_hist.validity) -- TODO filter by authority?
	limit 1;
	$$;

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