Google-cloud-go: FEATURE: BigQuery InferSchema include field details in error messages

[nfisher]

The BigQuery InferSchema is a nice convenience function for generating schemas. It would be helpful for debugging purposes if additional details were included in the error being returned including:

• field name.
• parent struct name.
• file.
• line number.

Line number/file would be nice but not essential.

Some of our structs/schemas have dozens of fields. As a result the current approach for resolving schema errors is either adding 1 field at a time for new schemas or commenting out fields for preexisting structs.

Example Behaviour

Using an unsupported type results in the following error string:

bigquery: unsupported type of field in struct

Desired Behaviour

Some variation like this where Bob is the field and Alice is the parent struct would be ideal:

bigquery: unsupported type of field (Bob) in struct (Alice)

[jadekler]

@shollyman WDYT?

[jba]

I'm doing it. It's clearly the right thing and I need a quick win during perf week.

[nfisher]

Thanks! Haven't had an opportunity to test this yet but looking at the change looks like it should tick the boxes. 👍