I have a dataset, which I created projections on. Due to a schema change, the projection might fail some day. What will happen ? Will the projection alone fail ? Will the dataset become unreadable ?
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When a build of a projection fails or the projection is not up-to-date with the dataset, the downstream builds will use the dataset instead. While it may have a performance impact if that projection was used in those builds, it will not prevent the downstream build from running or make the dataset unreadable.