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Merge pull request #42136 from ClickHouse/revert-27787

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Revert #27787
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Nikolai Kochetov 2022-10-07 20:38:38 +02:00 committed by GitHub
commit eccee280a2
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5 changed files with 46 additions and 2 deletions
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4
src/Storages/AlterCommands.cpp
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@ -755,9 +755,9 @@ bool isMetadataOnlyConversion(const IDataType * from, const IDataType * to)
const auto * nullable_from = typeid_cast<const DataTypeNullable *>(from);
const auto * nullable_to = typeid_cast<const DataTypeNullable *>(to);
if (nullable_to)
if (nullable_from && nullable_to)
{
from = nullable_from ? nullable_from->getNestedType().get() : from;
from = nullable_from->getNestedType().get();
to = nullable_to->getNestedType().get();
continue;
}

1
tests/queries/0_stateless/02456_alter-nullable-column-bag-2.reference Normal file
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@ -0,0 +1 @@
2

16
tests/queries/0_stateless/02456_alter-nullable-column-bag-2.sql Normal file
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@ -0,0 +1,16 @@
DROP TABLE IF EXISTS t1 SYNC;
CREATE TABLE t1 (v UInt64) ENGINE=ReplicatedMergeTree('/test/tables/{database}/test/t1', 'r1') ORDER BY v PARTITION BY v;
INSERT INTO t1 values(1);
ALTER TABLE t1 ADD COLUMN s String;
INSERT INTO t1 values(1, '1');
ALTER TABLE t1 MODIFY COLUMN s Nullable(String);
-- SELECT _part, * FROM t1;
alter table t1 detach partition 1;
SELECT _part, * FROM t1;
--0 rows in set. Elapsed: 0.001 sec.
alter table t1 attach partition 1;
select count() from t1;

1
tests/queries/0_stateless/02456_alter-nullable-column-bag.reference Normal file
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@ -0,0 +1 @@
1,"one",1,0

26
tests/queries/0_stateless/02456_alter-nullable-column-bag.sql Normal file
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@ -0,0 +1,26 @@
DROP TABLE IF EXISTS column_modify_test;
CREATE TABLE column_modify_test (id UInt64, val String, other_col UInt64) engine=MergeTree ORDER BY id SETTINGS min_bytes_for_wide_part=0;
INSERT INTO column_modify_test VALUES (1,'one',0);
INSERT INTO column_modify_test VALUES (2,'two',0);
-- on 21.9 that was done via mutations mechanism
ALTER TABLE column_modify_test MODIFY COLUMN val Nullable(String);
-- but since 21.10 it only applies that to new part, so old parts keep the old schema
--SELECT * FROM system.mutations;
INSERT INTO column_modify_test VALUES (3,Null,0);
--select name, path, type, active, modification_time from system.parts_columns where table='column_modify_test' and column='val';
-- till now everythings looks ok
--SELECT * FROM column_modify_test;
-- now we do mutation. It will affect one of the parts
-- and it what part it will update columns.txt to the latest 'correct' state w/o updating the column file!
alter table column_modify_test update other_col=1 where id = 1 SETTINGS mutations_sync=1;
-- row 1 is damaged now: the column files of val columns & columns.txt is out of sync!
SELECT *, throwIf(val <> 'one') FROM column_modify_test WHERE id = 1 FORMAT CSV;