BigQuery copy method can convert dict column to JSON string #1143
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By default without this change, a dict column will cause the copy method to fail.
This is a more robust followup to #1028 and #1068. At the time we decided to remove support for loading dict columns to BigQuery because there wasn't a super simple way to accomplish this. Instead we encouraged users to convert the dict columns to strings themselves if they desired to do so. This change makes that workaround happen by default, but it can be turned off with the
convert_dict_columns_to_json
flag toBigQuery().copy()