zeros_mt

Generates a stream of zeros (a table with one column ‘zero’ of type ‘UInt8’) of specified size. This table function is used in performance tests, where you want to spend as little time as possible to data generation while testing some other parts of queries. In contrast to the zeros, this table function is using multiple threads for data generation, according to the max_threads setting. Example: [example:1] This query will test the speed of randomPrintableASCII function using multiple threads. See also the system.zeros table.