Hi,
We have been querying external data sources using temporary tables, with JSON schema files (which include special characters in their "name" field) for a few months. Everything worked fine until a specific day when an error came up saying "Invalid field name \"iphone6+\". Fields must contain only letters, numbers, and underscores, start with a letter or underscore, and be at most 300 characters long.".
Since then, temporary tables creation process has failed over and over again. We've noticed that in BigQuery document, it is stated that flexible column names does not applied to external tables. However, as we mentioned above, it literally worked fine before.
Is it some kind of bugs or is it just that flexible column names do support external tables before, and stop supporting recently? We would appreciate any help!
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