Refactor partition groups and add tests #57
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jayshrivastava
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Jul 27, 2025
src/planning.rs
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| stage_id: stage.stage_id, | ||
| plan_bytes, | ||
| partition_group: partition_group.to_vec(), | ||
| partition_group: (partition_group.start() as u64..partition_group.end() as u64).collect(), |
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Please let me know if I can change the DDTask proto to use a range as well.
src/planning.rs
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| let new_child = Arc::new(PartitionIsolatorExec::new( | ||
| child.clone(), | ||
| partitions_per_worker.unwrap(), // we know it is a Some, here. | ||
| partition_count, |
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I think this was a bug before. The isolator seems to want the total number of partitions here.
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NGA-TRAN
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Very impressive first PR, @jayshrivastava
I have a few minor comments to suggest clearer names and more unit tests
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This change adds a new abstraction called a `Grouper` in `distribution_strategy.rs`. This is responsible for grouping partitions into partition groups. The new `distribution_strategy` module can be used to store other splitters and, in the future, distribution strategies like round robin etc. A "partition group" is now a range [starting_partition, ending_partition) instead of a Vec, so we improve space efficiency. In the proto layer, the `DDTask` proto still uses a Vec, so we simply expand the range into a Vec when creating them in `planning.rs::assign_to_workers`. Testing - unit tests in isolator.rs - unit tests for `build_replacement` in `planning.rs` - unit tests for the grouper in `distribution_strategy.rs`
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This change adds a new abstraction called a
Grouperindistribution_strategy.rs. This is responsible for grouping partitions into partition groups. The newdistribution_strategymodule can be used to store other splitters and, in the future, distribution strategies like round robin etc.A "partition group" is now a range [starting_partition, ending_partition) instead of a Vec, so we improve space efficiency. In the proto layer, the
DDTaskproto still uses a Vec, so we simply expand the range into a Vec when creating them inplanning.rs::assign_to_workers.This also fixes a bug in the isolator where it may not have reported the right number of partitions.
Testing
build_replacementinplanning.rsdistribution_strategy.rs