EQL - Simplify nested query where expressions after parsing

src/main/java/com/avaje/ebeaninternal/server/expression/InQueryExpression.java

@@ -38,6 +38,11 @@ class InQueryExpression extends AbstractExpression implements UnsupportedDocStor
     this.bindParams = bindParams;
   }
 
+  @Override
+  public void simplify() {
+    // do nothing
+  }
+
   @Override
   public void writeDocQuery(DocQueryContext context) throws IOException {
     throw new IllegalStateException("Not supported");