mingmwang commented on code in PR #6045:
URL: https://github.com/apache/arrow-datafusion/pull/6045#discussion_r1171059929
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datafusion/core/src/physical_plan/union.rs:
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@@ -340,8 +278,222 @@ impl ExecutionPlan for UnionExec {
}
}
+/// Combines multiple input streams by interleaving them.
+///
+/// This only works if all inputs have the same hash-partitioning.
+///
+/// # Data Flow
+/// ```text
+/// +---------+
+/// | |---+
+/// | Input 1 | |
+/// | |-------------+
+/// +---------+ | |
+/// | | +---------+
+/// +------------------>| |
+/// +---------------->| Combine |-->
+/// | +-------------->| |
+/// | | | +---------+
+/// +---------+ | | |
+/// | |-----+ | |
+/// | Input 2 | | |
+/// | |---------------+
+/// +---------+ | | |
+/// | | | +---------+
+/// | +-------->| |
+/// | +------>| Combine |-->
+/// | +---->| |
+/// | | +---------+
+/// +---------+ | |
+/// | |-------+ |
+/// | Input 3 | |
+/// | |-----------------+
+/// +---------+
+/// ```
+#[derive(Debug)]
+pub struct InterleaveExec {
+ /// Input execution plan
+ inputs: Vec<Arc<dyn ExecutionPlan>>,
+ /// Execution metrics
+ metrics: ExecutionPlanMetricsSet,
+ /// Schema of Union
+ schema: SchemaRef,
Review Comment:
Schema of `InterleaveExec`
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