

CREATE TABLE test_generic_events_all (APIKey UInt8, SessionType UInt8) ENGINE = MergeTree() PARTITION BY APIKey ORDER BY tuple();
INSERT INTO test_generic_events_all VALUES( 42, 42 );
ALTER TABLE test_generic_events_all ADD COLUMN OperatingSystem UInt64 DEFAULT 42;
SELECT OperatingSystem FROM test_generic_events_all PREWHERE APIKey = 42 WHERE SessionType = 42;
SELECT * FROM test_generic_events_all PREWHERE APIKey = 42 WHERE SessionType = 42;


CREATE TABLE test_generic_events_all (APIKey UInt8, SessionType UInt8) ENGINE = MergeTree() PARTITION BY APIKey ORDER BY tuple();
INSERT INTO test_generic_events_all VALUES( 42, 42 );
ALTER TABLE test_generic_events_all ADD COLUMN OperatingSystem UInt64 DEFAULT SessionType+1;
SELECT * FROM test_generic_events_all WHERE APIKey = 42 AND SessionType = 42;
SELECT OperatingSystem FROM test_generic_events_all WHERE APIKey = 42;
SELECT OperatingSystem FROM test_generic_events_all WHERE APIKey = 42 AND SessionType = 42;
SELECT OperatingSystem FROM test_generic_events_all PREWHERE APIKey = 42 WHERE SessionType = 42;
SELECT * FROM test_generic_events_all PREWHERE APIKey = 42 WHERE SessionType = 42;

