chore: fix

Author: ovr

rust/cubesql/cubesql/src/compile/engine/df/optimizers/plan_normalize.rs

@@ -725,9 +725,7 @@ fn expr_normalize(ctx: &Box<PlanNormalizeContext>, expr: &Expr) -> Result<Box<Ex
             let expr = expr.as_ref().map(|e| expr_normalize(ctx, e)).transpose()?;
             let when_then_expr = when_then_expr
                 .iter()
-                .map(|(when, then)| {
-                    Ok((expr_normalize(ctx, when)?, expr_normalize(ctx, then)?))
-                })
+                .map(|(when, then)| Ok((expr_normalize(ctx, when)?, expr_normalize(ctx, then)?)))
                 .collect::<Result<Vec<_>>>()?;
             let else_expr = else_expr
                 .as_ref()