wiedld commented on code in PR #17250:
URL: https://github.com/apache/datafusion/pull/17250#discussion_r2286506758
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datafusion/optimizer/src/optimize_projections/mod.rs:
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@@ -55,6 +55,24 @@ use datafusion_common::tree_node::{
/// The rule analyzes the input logical plan, determines the necessary column
/// indices, and then removes any unnecessary columns. It also removes any
/// unnecessary projections from the plan tree.
+///
+/// ## Schema, Field Properties, and Metadata Handling
+///
+/// The `OptimizeProjections` rule preserves schema and field metadata in most
optimization scenarios:
Review Comment:
This summarizes how the `OptimizeProjections` handles the schema, field
props, and metadata.
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