TheNeuralBit opened a new pull request #14135: URL: https://github.com/apache/beam/pull/14135
This modifies the ordering defined by is_subpartitioning_of from: ``` Nothing() < Index([i]) < Index([i, j]) < ... < Index() < Singleton() ``` to: ``` Singleton() < Index([i]) < Index([i, j]) < ... < Index() < Nothing() ``` Which is logically more correct, since `Singleton()` is equivalent to `Index([])`. The rest of the PR deals with the fallout from this change, which largely entails updated `preserves_partition_by` specs for computed expressions (e0aba2d), and updating the logic for fusing stages (29f41c0). It also includes a patch to have `Index.check` make a strong assertion about partioning, as discussed in BEAM-11324. 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