--
-- Copyright 2023 The Android Open Source Project
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
--     https://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.

-- Given two slice ids, returns whether the first is an ancestor of the second.
CREATE PERFETTO FUNCTION slice_is_ancestor(
  -- Id of the potential ancestor slice.
  ancestor_id LONG,
  -- Id of the potential descendant slice.
  descendant_id LONG
)
-- Whether `ancestor_id` slice is an ancestor of `descendant_id`.
RETURNS BOOL AS
SELECT
  ancestor.track_id = descendant.track_id AND
  ancestor.ts <= descendant.ts AND
  (ancestor.dur == -1 OR ancestor.ts + ancestor.dur >= descendant.ts + descendant.dur)
FROM slice ancestor
JOIN slice descendant
WHERE ancestor.id = $ancestor_id
  AND descendant.id = $descendant_id