Comment 1 for bug 1112514

The bug is easy to reproduce. Here is a simplified version:

-- create source table and sample data
CREATE TABLE source (id BIGINT, data BIGINT, PRIMARY KEY(id, data), INDEX (data));
INSERT INTO source (id, data) VALUES (1, 1), (2, 2), (3, 2), (4, 2), (5, 3);

-- create temporary table and insert-select into it
CREATE TEMPORARY TABLE temp (id BIGINT, data BIGINT, PRIMARY KEY (id, data));
-- this leaks
INSERT INTO temp (id, data) SELECT id, data FROM source WHERE data = 2;