Merge pull request #10617 from ClickHouse/lower-memory-usage-in-tests

Lower memory usage in tests

tests/queries/0_stateless/01012_serialize_array_memory_usage.sql

 -- serialization of big arrays shouldn't use too much memory
-set max_memory_usage = 3000000000;
-select ignore(x) from (select groupArray(number) x from numbers(33554433)) group by x format Null;
+set max_memory_usage = 300000000;
+select ignore(x) from (select groupArray(number) x from numbers(3355443)) group by x format Null;

tests/queries/1_stateful/00154_avro.reference

-17300372046749301651
-17300372046749301651
+13852817355252071515
+13852817355252071515

tests/queries/1_stateful/00154_avro.sql

 DROP TABLE IF EXISTS test.avro;
 
+SET max_threads = 1, max_block_size = 8192, min_insert_block_size_rows = 8192, min_insert_block_size_bytes = 1048576; -- lower memory usage
+
 CREATE TABLE test.avro AS test.hits ENGINE = File(Avro);
-INSERT INTO test.avro SELECT * FROM test.hits WHERE intHash64(WatchID) % 100 = 0;
+INSERT INTO test.avro SELECT * FROM test.hits LIMIT 10000;
 
-SELECT sum(cityHash64(*)) FROM test.hits WHERE intHash64(WatchID) % 100 = 0;
+SELECT sum(cityHash64(*)) FROM (SELECT * FROM test.hits LIMIT 10000);
 SELECT sum(cityHash64(*)) FROM test.avro;
 
 DROP TABLE test.avro;