CREATE EXTENSION IF NOT EXISTS pg_plan_tree_dot;

CREATE TABLE testtable1 (C1 int, C2 int);

INSERT INTO testtable1 (C1, C2) SELECT i, i FROM generate_series(0, 10000) AS i;

-- SELECT C2 FROM testtable1 ORDER BY C1;
SELECT generate_plan_tree_dot('SELECT C2 FROM testtable1 ORDER BY C1;', 'sample-sort.dot');

DROP TABLE testtable1 CASCADE;