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--source include/not_windows.inc
--source include/big_test.inc
--echo # We will run tests of non-trivial size to exercise the temporary table
--echo # overflow to disk functionality used by INTERSECT and EXCEPT logic
--echo # occuring both when writing the initial temporary result table as well
--echo # as when updating it when modifying counters, cf.
--echo # MaterializeIterator::MaterializeQueryBlock. We measure the time
--echo # needed for execution given four different setting for the internal
--echo # temporary tables and check their relative ranking to assert that
--echo # spill to disk actually happened.
--echo #
--echo # We have four scenarios we exercise:
--echo # 1. internal_tmp_mem_storage_engine == TempTable with default settings
--echo # Here we see spill to disk when doing the updating.
--echo # 2. internal_tmp_mem_storage_engine == HEAP
--echo # Here there is no spill to disk so quite fast.
--echo # 3. internal_tmp_mem_storage_engine == TempTable with a small setting
--echo # Here we see spill to disk when writing the initial tmp table. This case
--echo # is expected to be slower than case 1, since more less work is
--echo # before we need to move to the slower disk based storage (well, InnoDB,
--echo # what actually goes to disk is another matter...)
--echo # 4. internal_tmp_mem_storage_engine == TempTable with a large setting
--echo # Here there is no spill to disk so quite fast.
CREATE TABLE t(i INT, d DATE, c VARCHAR(60) CHARSET latin1) ENGINE=innodb;
set @@cte_max_recursion_depth = 100000;
INSERT INTO t
WITH RECURSIVE cte AS (
SELECT 0 AS i, '2022-04-30' AS d, 'abracadabra' as c
UNION
SELECT 1 AS i, '2022-04-30' AS d, 'rabarbra' as c
UNION
SELECT i+2, d, c FROM cte
WHERE i+2 < 65536
)
SELECT i,d,c FROM cte;
set @@cte_max_recursion_depth = default;
# insert one duplicate of each row
INSERT INTO t select i, d, c FROM t;
SELECT COUNT(*) FROM t;
let $query = SELECT COUNT(*) FROM (SELECT i,d,c FROM t INTERSECT SELECT i,d,c FROM t) derived;
--source include/query_expression_big.inc
let $query = SELECT COUNT(*) FROM (SELECT i,d,c FROM t EXCEPT SELECT i,d,c FROM t) derived;
--source include/query_expression_big.inc
DROP TABLE t;
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