col1	UInt8	DEFAULT	0			
col1	UInt32					
col2	UInt64	DEFAULT	col1 + 1			
col3	UInt64	MATERIALIZED	col1 + 2			
col4	UInt64	ALIAS	col1 + 3			
10	11
12	13
99
payload	String					
date	Date	MATERIALIZED	today()			
key	UInt64	MATERIALIZED	0 * rand()			
hello clickhouse
payload	String					
date	Date	MATERIALIZED	today()			
key	UInt64	MATERIALIZED	0 * rand()			
payload_length	UInt64	MATERIALIZED	length(payload)			
hello clickhouse	16
hello clickhouse	16
some string	11
hello clickhouse	16
some string	11
payload	String					
date	Date	MATERIALIZED	today()			
key	UInt64	MATERIALIZED	0 * rand()			
payload_length	UInt64	DEFAULT	length(payload)			
hello clickhouse	16
some string	11
payload	String					
date	Date	MATERIALIZED	today()			
key	UInt64	MATERIALIZED	0 * rand()			
payload_length	UInt64	DEFAULT	length(payload) % 65535			
hello clickhouse	16
some string	11
payload	String					
date	Date	MATERIALIZED	today()			
key	UInt64	MATERIALIZED	0 * rand()			
payload_length	UInt16	DEFAULT	length(payload)			
payload	String					
date	Date	MATERIALIZED	today()			
key	UInt64	MATERIALIZED	0 * rand()			
hello clickhouse
some string