ClickHouse/tests/queries/0_stateless/01246_buffer_flush.sql

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-- Tags: no-fasttest
2023-04-29 17:48:33 +00:00
SET function_sleep_max_microseconds_per_block = 4000000;
drop table if exists data_01256;
drop table if exists buffer_01256;
create table data_01256 as system.numbers Engine=Memory();
select 'min';
create table buffer_01256 as system.numbers Engine=Buffer(currentDatabase(), data_01256, 1,
5, 100, /* time */
4, 100, /* rows */
1, 1e6 /* bytes */
);
insert into buffer_01256 select * from system.numbers limit 5;
select count() from data_01256;
-- It is enough to ensure that the buffer will be flushed earlier then 2*min_time (10 sec)
select sleepEachRow(9) FORMAT Null SETTINGS function_sleep_max_microseconds_per_block=10e6;
select count() from data_01256;
drop table buffer_01256;
select 'max';
create table buffer_01256 as system.numbers Engine=Buffer(currentDatabase(), data_01256, 1,
100, 2, /* time */
0, 100, /* rows */
0, 1e6 /* bytes */
);
insert into buffer_01256 select * from system.numbers limit 5;
select count() from data_01256;
-- sleep 2 (min time) + 1 (round up) + bias (1) = 4
select sleepEachRow(2) from numbers(2) FORMAT Null;
select count() from data_01256;
drop table buffer_01256;
select 'direct';
create table buffer_01256 as system.numbers Engine=Buffer(currentDatabase(), data_01256, 1,
100, 100, /* time */
0, 9, /* rows */
0, 1e6 /* bytes */
);
insert into buffer_01256 select * from system.numbers limit 10;
select count() from data_01256;
select 'drop';
insert into buffer_01256 select * from system.numbers limit 10;
drop table if exists buffer_01256;
select count() from data_01256;
2020-11-11 15:29:36 +00:00
drop table data_01256;