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feat(core): RangeShuffleReaderExec — ordering-preserving shuffle reader (purely additive) #2255

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Merged
avantgardnerio merged 2 commits into from
Aug 8, 2026
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feat(core): RangeShuffleReaderExec — ordering-preserving shuffle reader (purely additive) #2255

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feat(core): RangeShuffleReaderExec — ordering-preserving shuffle read…
avantgardnerio Aug 8, 2026
338a7ac
docs(executor): TODO for RangeShuffleReaderExec late-bind
avantgardnerio Aug 8, 2026
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13 changes: 13 additions & 0 deletions ballista/core/proto/ballista.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ message BallistaPhysicalPlanNode {
OrderedRangeRepartitionExecNode ordered_range_repartition = 9;
PerPartitionFilterExecNode per_partition_filter = 10;
PartitionedBoundedWindowAggExecNode partitioned_bounded_window_agg = 11;
RangeShuffleReaderExecNode range_shuffle_reader = 12;
}
}

Expand Down Expand Up @@ -201,6 +202,18 @@ message ShuffleReaderPartition {
repeated PartitionLocation location = 1;
}

// Ordering-preserving shuffle reader. Reuses `ShuffleReaderPartition` for the
// M-shape source layout. Partitioning is derived from `partition.len()`
// (always `UnknownPartitioning`, range-partitioned by `merge_ordering`).
message RangeShuffleReaderExecNode {
repeated ShuffleReaderPartition partition = 1;
datafusion_common.Schema schema = 2;
uint32 stage_id = 3;
// Sort key the reader's k-way merge preserves. Advertised on the reader's
// `PlanProperties.eq_properties` for downstream consumers.
repeated datafusion.PhysicalSortExprNode merge_ordering = 4;
}

// CoalescePartitionsRule output: groups upstream partitions into coalesced output partitions.
// Empty when no coalesce is applied (the optional field on the parent message is absent).
message CoalescePlan {
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2 changes: 2 additions & 0 deletions ballista/core/src/execution_plans/mod.rs
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Expand Up @@ -27,6 +27,7 @@ mod partitioned_bounded_window_agg;
mod per_partition_filter;
pub mod plan_algebra;
mod range_repartition_common;
mod range_shuffle_reader;
mod runtime_stats;
mod shuffle_reader;
mod shuffle_writer;
Expand All @@ -46,6 +47,7 @@ pub use ordered_range_repartition::OrderedRangeRepartitionExec;
pub use partitioned_bounded_window_agg::PartitionedBoundedWindowAggExec;
pub use per_partition_filter::{PerPartitionFilterExec, range_partition_predicates};
pub use plan_algebra::{preserves_distribution, preserves_partitioning};
pub use range_shuffle_reader::RangeShuffleReaderExec;
pub use runtime_stats::{
MergedRuntimeStats, RuntimeStatsExec, TaskRuntimeStats,
collect_reports as collect_runtime_stats_reports, cut_partitions,
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