ch-sc commented on code in PR #7833:
URL: https://github.com/apache/arrow-datafusion/pull/7833#discussion_r1363540750
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datafusion/optimizer/src/push_down_projection.rs:
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@@ -423,7 +426,93 @@ pub fn collect_projection_expr(projection: &Projection) ->
HashMap<String, Expr>
.collect::<HashMap<_, _>>()
}
-// Get the projection exprs from columns in the order of the schema
+/// Accumulate the memory size of a data type measured in bits.
+///
+/// Nested types are traversed and increment `nesting` on every level.
Review Comment:
Makes sense. Added a comment about variable sized types. Feel free to
rephrase if you think something is missing.
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