Perhaps this check is better placed in `BigQueryReader.__init__`, since it already makes the same assumption that either a table reference or query is set: https://github.com/apache/beam/blob/5aacd6bcbf78d0b70ff3d289ad7fbc0a156a54c8/sdks/python/apache_beam/io/gcp/bigquery.py#L649-L660
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