Question: How to upload array of strings data in bigquery using csv upload method.

[VikramTiwari]

The schema requires being updated to be STRING with mode as repeatable. But with this schema when I try to push a CSV file, it gives me following error:

google.cloud.exceptions.BadRequest: 400 Cannot load CSV data with a repeated field.

Anything I might be missing?

Related SO question: https://stackoverflow.com/questions/45315063/how-to-add-array-of-strings-as-a-schema-value-for-bigquery/45315110

[tseaver]

This is a limitation of the CSV file format, which can't really represent multi-valued fields: each "column" corresponds to a single field.

The docs for nested / repeated fields say:

BigQuery supports loading and exporting nested and repeated data in the form of JSON and Avro files.

[dhruvluthra1996]

I have specified a column with the type string and mode repeated but when I am pushing an array data through python it creates multiple rows of different elements of array

[tseaver]

@dhruvluthra1996 mode='REPEATED' implies that you pass a list/sequence of strings for the value. The behavior you are seeing is because Python strings are themselves sequences (whose elements are one-character strings).