[GitHub] [shardingsphere] IneverStop commented on issue #18487: Can not get correct result

[GitBox <gi...@apache.org>]

IneverStop commented on issue #18487:
URL: https://github.com/apache/shardingsphere/issues/18487#issuecomment-1161340774

   ```java
   org.apache.shardingsphere.infra.binder.segment.select.projection.engine.ProjectionEngine
   
       private Collection<ColumnProjection> getColumnProjections(final Collection<Projection> projections) {
           Collection<ColumnProjection> result = new LinkedList<>();
           for (Projection each : projections) {
               if (each instanceof ColumnProjection) {
                   result.add((ColumnProjection) each);
               }
               if (each instanceof ShorthandProjection) {
                   result.addAll(((ShorthandProjection) each).getActualColumns().values());
               }
           }
           return result;
       }
   ```
   
   `id + 1` is a `ExpressionProjection`, so this function will skip `ExpressionProjection`, may be this occur the problem.


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