[Ready for review, DO NOT MERGE] Render ephemeral dbt models as EmptyOperator by default#2759
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Add a centralized EMPTY_OPERATOR_CLASS constant that resolves to airflow.providers.standard.operators.empty.EmptyOperator on Airflow 3 and the legacy airflow.operators.empty.EmptyOperator on Airflow 2. Use it for the source-without-freshness rendering path, which previously hardcoded the legacy path and emitted a DeprecatedImportWarning on Airflow 3.
Ephemeral models are inlined as CTEs into downstream models and are never written to the warehouse, so running them through a dbt operator is a no-op that still spends worker time and issues warehouse metadata queries. Add RenderConfig.ephemeral_models_as_empty_operator (default True) so that ephemeral models render as EmptyOperator tasks. The node stays in the graph, preserving the dependency chain that passes through it, while avoiding the wasted dbt invocation and decluttering the DAG. Set it to False to keep rendering ephemeral models as regular dbt run tasks.
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The PR is ready for review. Please do not merge this PR. It relies on #2758 to be merged first. |
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Closes #1133.
Ephemeral dbt models are inlined as CTEs into downstream models and are never written to the warehouse, so running them through a dbt operator is a no-op that still spends worker time and issues warehouse metadata queries. Excluding them instead breaks the dependency chain for refs that pass through them.
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RenderConfig.ephemeral_models_as_empty_operator(defaultTrue): ephemeral models render asEmptyOperatortasks. The node stays in the graph, so the dependency chain passing through it is preserved, while the wasted dbt invocation is avoided and the DAG is decluttered. Set toFalseto keep rendering them as regular dbt run tasks.Taking forward the work done in #1625
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