gene-bordegaray commented on code in PR #25009:
URL: https://github.com/apache/datafusion/pull/25009#discussion_r4017913922
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datafusion/physical-plan/src/projection.rs:
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@@ -673,20 +673,34 @@ impl ExecutionPlan for ProjectionExec {
metrics: _,
// Derived plan properties, recomputed on decode.
cache: _,
- // Derived metadata comparison, recomputed with the projector.
- overrides_metadata: _,
+ overrides_metadata,
} = self;
let projection_exprs = projector.projection().as_ref();
let input = ctx.encode_child(input)?;
let expr = ctx.encode_expressions(projection_exprs.iter().map(|p|
&p.expr))?;
let expr_name = projection_exprs.iter().map(|p|
p.alias.clone()).collect();
+ let output_schema = projector.output_schema();
+ // Keep inherited metadata self-contained, and retain empty overrides
Review Comment:
what does self-contained here mean
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