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astronomer / astronomer-cosmos

Run your dbt Core projects as Apache Airflow DAGs and Task Groups with a few lines of code
https://astronomer.github.io/astronomer-cosmos/
Apache License 2.0
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[Feature request] Build operator as a test behavior: `TestBehavior.BUILD` #892

Open dwreeves opened 6 months ago

dwreeves commented 6 months ago

In Cosmos 1.4, the "build" operator was added.

This is not currently being used in the DbtTaskGroup / DbtDag API. But there is one use case that can be supported: tests! You can run tests and a model in a single dbt invocation using dbt build.

Why would someone want this? A big reason is to reduce the time of DAG runs. Splitting out tests into two Airflow tasks-- one for the node and one for the test-- can slow things down for users who are facing huge bottlenecks in spinning up nodes, e.g. they are not using partial parsing.

This is probably not a simple change because it most likely requires changing some internal assumptions regarding how Cosmos parses DAGs.

I'm very open to someone else taking on this issue, too.

dosubot[bot] commented 6 months ago

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tatiana commented 4 months ago

Hi @dwreeves , I like your proposal. What do you think we introduced this as TestBehaviour.BUILD? I believe this is a relatively small change.