$CLICKHOUSE_CLIENT -q "insert into function file(data1.jsonl) select NULL as x from numbers(10) settings engine_file_truncate_on_insert=1"
$CLICKHOUSE_CLIENT -q "insert into function file(data2.jsonl) select NULL as x from numbers(10) settings engine_file_truncate_on_insert=1"
$CLICKHOUSE_CLIENT -q "insert into function file(data3.jsonl) select NULL as x from numbers(10) settings engine_file_truncate_on_insert=1"
$CLICKHOUSE_CLIENT -q "insert into function file(data4.jsonl) select number % 2 ? number : NULL as x from numbers(10) settings engine_file_truncate_on_insert=1"