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chore: Clarify EmptyRelation description #17157

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Merged
merged 4 commits into from
Aug 12, 2025
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chore: Clarify EmptyRelation description #17157

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chore: Clarify `EmptyRelation` description
comphead Aug 12, 2025
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chore: Clarify `EmptyRelation` description
comphead Aug 12, 2025
d771189
chore: Clarify `EmptyRelation` description
comphead Aug 12, 2025
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chore: Clarify `EmptyRelation` description
comphead Aug 12, 2025
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4 changes: 3 additions & 1 deletion datafusion/expr/src/logical_plan/plan.rs
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Expand Up @@ -2040,7 +2040,9 @@ impl ToStringifiedPlan for LogicalPlan {
}
}

/// Produces no rows: An empty relation with an empty schema
/// Relationship produces 0 or 1 placeholder rows with specified output schema
/// In most cases the output schema for `EmptyRelation` would be empty,
/// however, it can be non-empty typically for optimizer rules
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct EmptyRelation {
/// Whether to produce a placeholder row
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