comphead commented on code in PR #8022:
URL: https://github.com/apache/arrow-datafusion/pull/8022#discussion_r1379398276
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datafusion/physical-expr/src/partitioning.rs:
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@@ -15,14 +15,43 @@
// specific language governing permissions and limitations
// under the License.
-//! [`Partitioning`] and [`Distribution`] for physical expressions
+//! [`Partitioning`] and [`Distribution`] for `ExecutionPlans`
use std::fmt;
use std::sync::Arc;
use crate::{expr_list_eq_strict_order, EquivalenceProperties, PhysicalExpr};
-/// Partitioning schemes supported by operators.
+/// Partitioning schemes supported by [`ExecutionPlan`]s.
+///
+/// A partition represents an independent stream that an `ExecutionPlan` can
+/// produce in parallel. Each `ExecutionPlan` must produce at least one
+/// partition, and the number of partitions varies based on the input and the
+/// operation performed.
+///
+/// ```text
+/// ▲ ▲ ▲
+/// │ │ │
+/// │ │ │ An ExecutionPlan with 3
+/// │ │ │ output partitions will
+/// ┌───┴──────┴──────┴──┐ produce 3 streams of
+/// │ ExecutionPlan │ RecordBatches that run in
+/// └────────────────────┘ parallel.
Review Comment:
would be nice to show the input partition as well
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