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Test case for altering to LowCardinality when data part is empty

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This commit is contained in:
Mikhail Filimonov 2019-12-02 16:02:52 +01:00
parent 1142c142c8
commit 5228f5f2eb
2 changed files with 14 additions and 0 deletions
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3
dbms/tests/queries/0_stateless/01035_lc_empty_part_bug.reference Normal file
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wait for delete to finish 0
still alive
100

11
dbms/tests/queries/0_stateless/01035_lc_empty_part_bug.sql Normal file
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-- that test is failing on versions <= 19.11.12
DROP TABLE IF EXISTS lc_empty_part_bug;
create table lc_empty_part_bug (id UInt64, s String) Engine=MergeTree ORDER BY id;
insert into lc_empty_part_bug select number as id, toString(rand()) from numbers(100);
alter table lc_empty_part_bug delete where id < 100;
SELECT 'wait for delete to finish', sleep(1);
alter table lc_empty_part_bug modify column s LowCardinality(String);
SELECT 'still alive';
insert into lc_empty_part_bug select number+100 as id, toString(rand()) from numbers(100);
SELECT count() FROM lc_empty_part_bug WHERE not ignore(*);
DROP TABLE IF EXISTS lc_empty_part_bug;