mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-11 18:14:03 +00:00
31 lines
1.3 KiB
SQL
31 lines
1.3 KiB
SQL
set allow_experimental_low_cardinality_type = 1;
|
|
|
|
select 'NativeBlockInputStream';
|
|
select toTypeName(dict), dict, lowCardinalityIndices(dict), lowCardinalityKeys(dict) from (select '123_' || toLowCardinality(v) as dict from (select arrayJoin(['a', 'bb', '', 'a', 'ccc', 'a', 'bb', '', 'dddd']) as v));
|
|
select '-';
|
|
select toTypeName(dict), dict, lowCardinalityIndices(dict), lowCardinalityKeys(dict) from (select '123_' || toLowCardinality(v) as dict from (select arrayJoin(['a', Null, 'bb', '', 'a', Null, 'ccc', 'a', 'bb', '', 'dddd']) as v));
|
|
|
|
select 'MergeTree';
|
|
|
|
drop table if exists test.lc_small_dict;
|
|
drop table if exists test.lc_big_dict;
|
|
|
|
create table test.lc_small_dict (str StringWithDictionary) engine = MergeTree order by str;
|
|
create table test.lc_big_dict (str StringWithDictionary) engine = MergeTree order by str;
|
|
|
|
insert into test.lc_small_dict select toString(number % 1000) from system.numbers limit 1000000;
|
|
insert into test.lc_big_dict select toString(number) from system.numbers limit 1000000;
|
|
|
|
detach table test.lc_small_dict;
|
|
detach table test.lc_big_dict;
|
|
|
|
attach table test.lc_small_dict;
|
|
attach table test.lc_big_dict;
|
|
|
|
select sum(toUInt64OrZero(str)) from test.lc_small_dict;
|
|
select sum(toUInt64OrZero(str)) from test.lc_big_dict;
|
|
|
|
drop table if exists test.lc_small_dict;
|
|
drop table if exists test.lc_big_dict;
|
|
|