Note the difference between a null value and an empty string. The line above 6659 has blank lines but no zeros.
To reproduce, I created a table with this diagram:
[{"name":"a","type":"TIMESTAMP","mode":"NULLABLE"},
{"name":"b","type":"TIMESTAMP","mode":"NULLABLE"}]
Then download this file:
"",""
:
File: 0 / Line:1 / Field:1, Could not parse '' as a timestamp
:
,
, , .
, , BigQuery , ETL timestamp BigQuery.