039.sql
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039.sql
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	-- SWH DB schema upgrade
	-- from_version: 38
	-- to_version: 39
	-- description: Improve find directory entry by path

	insert into dbversion(version, release, description)
	values(39, now(), 'Work In Progress');

	-- Find a directory entry by its path
	create or replace function swh_find_directory_entry_by_path(
	walked_dir_id sha1_git,
	dir_or_content_path bytea[])
	returns directory_entry
	language plpgsql
	as $$
	declare
	end_index integer;
	paths bytea default '';
	path bytea;
	res bytea[];
	r record;
	begin
	end_index := array_upper(dir_or_content_path, 1);
	res[1] := walked_dir_id;

	for i in 1..end_index
	loop
	path := dir_or_content_path[i];
	-- concatenate path for patching the name in the result record (if we found it)
	if i = 1 then
	paths = path;
	else
	paths := paths \|\| '/' \|\| path; -- concatenate paths
	end if;

	if i <> end_index then
	select *
	from swh_directory_walk_one(res[i] :: sha1_git)
	where name=path
	and type = 'dir'
	limit 1 into r;
	else
	select *
	from swh_directory_walk_one(res[i] :: sha1_git)
	where name=path
	limit 1 into r;
	end if;

	-- find the path
	if r is null then
	return null;
	else
	-- store the next dir to lookup the next local path from
	res[i+1] := r.target;
	end if;
	end loop;

	-- at this moment, r is the result. Patch its 'name' with the full path before returning it.
	r.name := paths;
	return r;
	end
	$$;