[Fix](Variant) fix variant predicate rewrite OrToIn with wrong plan (#28695)

using the name without paths info will lead to wrong In plan, e.g.
```
where cast(v:a as text) = 'hello' or cast(v:b as text) = 'world'
```
will be rewrite to:
```
where cast(v as text) in ('hello', 'world')
``
This is wrong, because they are different slots

fe/fe-core/src/main/java/org/apache/doris/analysis/SlotRef.java

@@ -540,6 +540,9 @@ public class SlotRef extends Expr {
     }
 
     public String getColumnName() {
+        if (subColPath != null && !subColPath.isEmpty()) {
+            return col + "." + String.join(".", subColPath);
+        }
         return col;
     }