pabloem commented on issue #11206: [BEAM-9598] Ensuring _CustomBigQuerySource ValueProvider is only checked when strictly needed URL: https://github.com/apache/beam/pull/11206#issuecomment-603550412 r: @TheNeuralBit The problem here was that `check_accessible`[1] was checking that the ValueProvider of `self.query` for the _CustomBigQuerySource was accessible. `query` is not always accessible in this case because the _CustomBigQuerySource can read from queries, or directly from tables. Note how `estimate_size`[2] has two paths - one for query, and one for table. The tests were failing because `query` was `None`. The check_accessible annotations remain in functions that depend directly on query.[3] [1] https://github.com/apache/beam/blob/b91560cc354da471e3de502aad78dd059997a3d0/sdks/python/apache_beam/options/value_provider.py#L125-L139 [2] https://github.com/apache/beam/blob/master/sdks/python/apache_beam/io/gcp/bigquery.py#L642-L660 [3] https://github.com/apache/beam/blob/master/sdks/python/apache_beam/io/gcp/bigquery.py#L699-L716
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