mlauter opened a new pull request, #64505:
URL: https://github.com/apache/airflow/pull/64505
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## Description
Adds an ``extra_config`` parameter that is merged into the BigQuery load job
configuration (when ``external_table=False``) or the external table
configuration (when ``external_table=True``), allowing callers to set any API
field not exposed as a top-level operator param without subclassing.
Deprecates ``src_fmt_configs`` in favor of ``extra_config``.
### Rationale
GCSToBigQueryOperator explicitly validates every parameter it accepts
against a known list of valid BigQuery configuration fields. This makes it
impossible to use any API option that isn't already exposed as a top-level
operator param without subclassing or monkey-patching. In order to support all
possible configuration options, we'd need to add a lot of complexity to the
operator, and we'd need to change it any time google added a parameter.
Rather than continuing to add individual params for every possible API
option, this PR adds a single extra_config dict that is merged directly into
the underlying BigQuery configuration at execution time — into
`JobConfigurationLoad` when loading into an existing table, or into
`ExternalDataConfiguration` when creating an external table. Keys in
`extra_config` take precedence over the operator's own top-level params (just
as keys in `src_format_configs` took precedence over the top level params.
This follows a similar pattern to the `configuration` passthrough in
`BigQueryInsertJobOperator`.
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