sgrebnov commented on code in PR #13267:
URL: https://github.com/apache/datafusion/pull/13267#discussion_r1830095891
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datafusion/common/src/config.rs:
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@@ -636,6 +636,10 @@ config_namespace! {
/// then the output will be coerced to a non-view.
/// Coerces `Utf8View` to `LargeUtf8`, and `BinaryView` to
`LargeBinary`.
pub expand_views_at_output: bool, default = false
+
+ /// When set to true, the `optimize_projections` rule will not attempt
to move, add, or remove existing projections.
+ /// This flag helps maintain the original structure of the
`LogicalPlan` when converting it back into SQL via the `unparser` module. It
ensures the query layout remains simple and readable, relying on the underlying
SQL engine to apply its own optimizations during execution.
+ pub optimize_projections_preserve_existing_projections: bool, default
= false
Review Comment:
Might it be better to make this flag more generic, for example, just
`preserve_existing_projections` or `prefer_existing_plan_nodes`, so it can be
reused in the future in similar cases
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