merge main

parser/src/ast/fmt.rs

@@ -716,6 +716,11 @@ impl ToTokens for Expr {
                 op.to_tokens(s, context)?;
                 rhs.to_tokens(s, context)
             }
+            Self::Register(reg) => {
+                // This is for internal use only, not part of SQL syntax
+                // Use a special notation that won't conflict with SQL
+                s.append(TK_VARIABLE, Some(&format!("$r{reg}")))
+            }
             Self::Case {
                 base,
                 when_then_pairs,