andygrove commented on a change in pull request #8746:
URL: https://github.com/apache/arrow/pull/8746#discussion_r529223287
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File path: rust/datafusion/src/optimizer/utils.rs
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@@ -24,7 +24,11 @@ use arrow::datatypes::{Schema, SchemaRef};
use super::optimizer::OptimizerRule;
use crate::error::{DataFusionError, Result};
use crate::logical_plan::{Expr, LogicalPlan, PlanType, StringifiedPlan};
-use crate::prelude::col;
+use crate::prelude::{col, lit};
+use crate::scalar::ScalarValue;
+
+const CASE_EXPR_MARKER: &str = "__DATAFUSION_CASE_EXPR__";
Review comment:
I couldn't think of another way to do the expression rewriting with our
current design. This expression is quite different from the ones implemented so
far.
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