-- Tags: distributed drop table if exists merge_distributed; drop table if exists merge_distributed1; set allow_deprecated_syntax_for_merge_tree=1; create table merge_distributed1 ( CounterID UInt32, StartDate Date, Sign Int8, VisitID UInt64, UserID UInt64, StartTime DateTime, ClickLogID UInt64) ENGINE = CollapsingMergeTree(StartDate, intHash32(UserID), tuple(CounterID, StartDate, intHash32(UserID), VisitID, ClickLogID), 8192, Sign); insert into merge_distributed1 values (1, '2013-09-19', 1, 0, 2, '2013-09-19 12:43:06', 3); create table merge_distributed ( CounterID UInt32, StartDate Date, Sign Int8, VisitID UInt64, UserID UInt64, StartTime DateTime, ClickLogID UInt64) ENGINE = Distributed(test_shard_localhost, currentDatabase(), merge_distributed1); alter table merge_distributed1 add column dummy String after CounterID; alter table merge_distributed add column dummy String after CounterID; describe table merge_distributed; show create table merge_distributed; insert into merge_distributed1 values (1, 'Hello, Alter Table!','2013-09-19', 1, 0, 2, '2013-09-19 12:43:06', 3); select CounterID, dummy from merge_distributed where dummy <> '' limit 10; alter table merge_distributed drop column dummy; describe table merge_distributed; show create table merge_distributed; --error: should fall, because there is no `dummy1` column alter table merge_distributed add column dummy1 String after CounterID; select CounterID, dummy1 from merge_distributed where dummy1 <> '' limit 10; -- { serverError 47 } drop table merge_distributed; drop table merge_distributed1;