refactor(bigframes): enable sqlglot as the default compiler with failsafe mechanism#16602
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This pull request introduces a compiler fallback mechanism in the BigQueryCachingExecutor, allowing the system to switch from sqlglot to ibis if a BadRequest occurs during compilation. It replaces the compiler utility with a more flexible compile_sql function and adds tracking labels to BigQuery jobs to identify the used compiler. Feedback identifies a critical AttributeError due to an outdated __all__ entry, a typo in the newly added unit tests, and a potential parsing risk when applying sqlglot_ir transformations to SQL generated by the ibis compiler during fallback.
packages/bigframes/tests/unit/session/test_bq_caching_executor.py
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Internal issue 417774347