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37 lines
1.7 KiB
SQL
37 lines
1.7 KiB
SQL
drop table if exists merge;
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drop table if exists merge1;
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drop table if exists merge2;
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create table merge1 ( 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);
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insert into merge1 values (1, '2013-09-19', 1, 0, 2, '2013-09-19 12:43:06', 3);
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create table merge2 ( 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);
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insert into merge2 values (2, '2013-09-19', 1, 0, 2, '2013-09-19 12:43:06', 3);
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create table merge ( CounterID UInt32, StartDate Date, Sign Int8, VisitID UInt64, UserID UInt64, StartTime DateTime, ClickLogID UInt64) ENGINE = Merge(currentDatabase(), 'merge\[0-9\]');
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alter table merge1 add column dummy String after CounterID;
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alter table merge2 add column dummy String after CounterID;
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alter table merge add column dummy String after CounterID;
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describe table merge;
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show create table merge;
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insert into merge1 values (1, 'Hello, Alter Table!','2013-09-19', 1, 0, 2, '2013-09-19 12:43:06', 3);
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select CounterID, dummy from merge where dummy <> '' limit 10;
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alter table merge drop column dummy;
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describe table merge;
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show create table merge;
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--error: must correctly fall into the alter
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alter table merge add column dummy1 String after CounterID;
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select CounterID, dummy1 from merge where dummy1 <> '' limit 10;
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drop table merge;
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drop table merge1;
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drop table merge2;
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