Fix flaky 00156_max_execution_speed_sample_merge by using small data and more predictable timings, #2

Author: arsenmuk

tests/queries/0_stateless/00156_max_execution_speed_sample_merge.sql

@@ -13,7 +13,7 @@ CREATE TEMPORARY TABLE times (t DateTime);
 
 DROP TABLE IF EXISTS t00156_max_execution_speed_sample_merge;
 CREATE TABLE t00156_max_execution_speed_sample_merge (v UInt64);
-INSERT INTO t00156_max_execution_speed_sample_merge SELECT number FROM numbers(8);
+INSERT INTO t00156_max_execution_speed_sample_merge SELECT number FROM numbers(28);
 
 INSERT INTO times SELECT now();
 SELECT * FROM t00156_max_execution_speed_sample_merge WHERE sleepEachRow(0.1) == 0 FORMAT Null;