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MDEV-19713 Remove big_tables system variable

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mark big_tables deprecated, the server can put temp tables on disk
as needed avoiding "table full" errors.

in case someone would really need to force a tmp table to be created
on disk from the start and for testing allow tmp_memory_table_size
to be set to 0.

fix tests to use that instead (and add a test that it actually
works).

make sure in-memory TREE size limit is never 0 (it's [ab]using
tmp_memory_table_size at the moment)

remove few sys_vars.*_basic tests
This commit is contained in:
Sergei Golubchik
2019-09-18 14:17:26 +02:00
parent de9ef03ae6
commit cd41ffe1f1
47 changed files with 453 additions and 1155 deletions
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4
mysql-test/main/subselect_cache.test
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@ -429,12 +429,12 @@ show status like "subquery_cache%";
drop table t1;
--echo #test of big_tables switch and outer table reference in subquery with grouping
set big_tables=1;
set tmp_memory_table_size=0; # force on-disk tmp table
CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
INSERT INTO t1 VALUES (1,1),(2,1),(3,2),(4,2),(5,3),(6,3);
SELECT (SELECT t1_outer.a FROM t1 AS t1_inner GROUP BY b LIMIT 1) FROM t1 AS t1_outer;
drop table t1;
set big_tables=0;
set tmp_memory_table_size=default;
--echo #test of function reference to outer query
set local group_concat_max_len=400;