src/trace_processor/metrics/sql/android/composition_layers.sql

--
-- Copyright 2021 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.

DROP VIEW IF EXISTS {{output}};
CREATE VIEW {{output}} AS
WITH composition_layer_counts AS (
  SELECT
    LAG(ts) OVER (ORDER BY ts) AS ts,
    value
  FROM counter c
  JOIN process_counter_track t ON c.track_id = t.id
  WHERE t.name = '{{track_name}}'
)
SELECT
  ts,
  value
FROM composition_layer_counts
WHERE value >= 0 AND ts IS NOT NULL;